Religious Summary

Introduction

The approach to the concept of religion has both changed and did not change during the thousand years-long reign of the Dominion. The slow retreat of organized religion from the most developed countries was mostly halted by the Dark Lord invasion, when in the face of the tragedies of the Great Multiversal War many turned to religion for answers. Organized religions have also strengthened their grip among the less-developed countries, due to being the driving power behind rebuilding efforts after the invasion was repelled (as the surviving countries of that time were mostly concerned with bringing the war to the Dark Lords).
However, the few centuries of the Golden Age of Mankind has once again weakened their position. The concepts of afterlife and morality appeared to be less interesting in the time when Mankind was akin to gods. They never died out, and many has found themselves a nice little niches (a good example might be Christian holdout in what is know known as Elysium). In this state they lasted until the Blackout.
The Blackout has crushed the technological base of human colonies outside of Ferra, forcing their inhabitants to once again think about some greater ideals to make their life more bearable. Combined with increasing atheism of the Ferran' government (a side effect of said government needing a scapegoat for the growing problems that the Dominion was facing) and the resulting emigration of the believers to the colonies, it resulted with another period of religious resurgence. It was also at that time that the Church of the Highmost and the Temple of the Seven - the two religious organizations with interest in converting the multiverse - showed up.
The System reacted to the spike in the interest in religion (together with the sudden spike in power supplied to it by the captive Dark Lords, due to them reaching their rebirth stage) with growth of the first religious character classes - simultaneously granting those to the Church, the Temple, the Covenant, and all surviving branches of old religions, especially Christianity, Islam, and eastern religions of Earth (such as buddhism or shintoism).
The final blow to the numerous holdouts of atheism or agnosticism throughout the multiverse was struck when the System updated itself and give birth to the Cults of the Ascended. Soon after the Blackout the first posthuman deity was born, offering its guidance, blessings and protection in exchange for worship. The existence of gods was no longer questionable - and soon, atheism has turned into naytheism (and become a fringe belief) everywhere aside from Ferra, whose population continued to see itself as akin to gods.

Religions List

Major Religions

Church of the Highmost is a monotheistic religion typically considered to be a particularly successful branch of Christianity, with its headquarters located in Elysium. It worships the Highmost, the trinitarian Creator-God (with Jesus Christ considered to be a part of it). Its chief values are honesty, kindness, and charity, but has no problem with using violence in self-defense or against people who really earned it.
Followers of the Church agree that other gods and entities on similar level exist - it's hard not to, considering the circumstances. They to use much more religiously-neutral term of 'Ascendants' to describe them as a whole. The exception are the demigods and gods that were sufficiently 'tested' (and their moral standing and past achievements are considered pure enough), who are typically referred to as 'living saints' and 'saints' respectively.
While the worship of them is typically allowed (and even then, it's less direct worship and more reverence and asking for intercession before Highmost), this can be only said about the fully accepted Ascendants. Situation is much more... dogmatic with unaligned Ascendants, and extremely negative when it comes to evil ones. There is also an eternal enmity between the Church of the Highmost and the Temple of the Seven.
The holy magic of the Church is grouped into six Aspects. Aspects of the Knight and the Crusader cover close quarters combat, being the defensive and offensive variant respectively. Aspect of the Mage covers empowered and 'blessed' elemental magic, with no connection to the realm of Chaos. Aspect of the Martyr includes healing and defensive magic. Aspect of the Disciple includes some terrifyingly powerful reality-warping magic (and is considered to be the most powerful of them all), while Aspect of the Inquisitor is mostly concerned with truth, finding what's hidden, and destroying evil (majority of its offensive magic has its damaged scaled to one's amount of evil deeds, and scaled to almost ridiculous degree).
Temple of the Seven is a polytheistic religion worshipping High Archons - a pantheon of seven Powers (with three more being considered 'fallen' Black Archons at war with the rest). They are followed by a number of Archons (lesser Archons) and a lot of Demi-Archons ('vassalized' and incorporated Gods).
The Temple is an organized religion, although to a much lesser degree than its traditional rival, the Church of the Highmost. It has a set list of High Archons that are worshipped on many worlds, each offering their own special brand of magic. Their interest in generally understood morality is rather scarce - they seek worship and reward devotion, with little regard to the way their worshippers act. Since humans tend to not be violent murders by nature (it's more of an exception), the Temple's societies tend to be morally gray but rarely go full black. Although when they do that, they do that really hard.
The High Archons include the Everlasting Sun (god of light, order and rulers), Great Mother (goddess of fertility, sex and motherhood), Night Eternal (goddess of vagrants, outcasts, thieves and murderers), Patient Hunter (god of war that also doubles as the god of hunting and combat as a whole), Crown of Enlightenment (two-faced and two-sexed god overseeing both creation and destruction, worshipped as god of magic and knowledge), the Worm-That-Walks (god of death, burial and decay), and finally the Moonlit Anvil (goddess of flesh and change, equally interested in her worshippers growing in strength and muscles through training, covering their body in tattoos and committing self-mutilation - it's all about change).
Each of the High Archonts has their own form of theurgy, and through it, their own character classes.
Cults of the Ascended are the general term for the myriad minor religions (often limited to only a single world, or even a single country) worshipping gods born through the System from former posthumans, without said gods being vassals to some Powers. Their method of worship varies from organized religions following relatively established pantheons (capable of giving their followers some measure of afterlife), to evil cults of a single deity, and with various other forms in the middle.
Gods of the Ascended tend to be very powerful, and have entire classes dedicated to it (unlike the much weaker pre-Gods demigods). However most of for example gods of nature will offer relatively similar portfolio of skills and powers, being differentiated mostly by character traits, details of preferred worship methods, aesthetics and power level. There are many divine archetypes, with most pantheons having at least a single deity per archetype.
This is the most common form of religious worship throughout the multiverse, with hundreds of pantheons and tens of thousand of gods. However each pantheon is typically operating on their own, meaning that none of them can hope to match up to the Church of the Highmost, or the Temple of the Seven. However they can prove to be quite an issue when a handful of pantheons cooperate.

Minor

Old Faiths are a common term for numerous surviving religions dating back to the Old Earth. This includes vestigial remnants of Christianity, Islam, Buddhism, Shintoism, Zoroastrianism and Hinduism - plus some even lesser religions (for example 'post-neopagans', Wiccans etc.) Many of them had integrated some degrees of religious syncretism as a response to the growth of the ascendant worship and the two major religions. For example majority of remaining Christian churches considers themselves to be under the Church of the Highmost protection, if not its allies (or an autonomous part of it).
The thousand years of living in a world of numerous incredibly powerful entities (many of which call themselves gods) didn't treat those religions kindly. One can expect a lot of differences between buddhists from two different worlds, despite both standing as parts of the same thing. On the other hand, those that survived has mostly adapted to the circumstances.
Most of the notable branches of the Old Faiths have their own classes and magic. This tends to be shared between the multiverse - you can expect relatively similar theurgies from various branches of Christianity (although you can also expected those to be shared to a various degree by the Church of the Highmost).
Ashen Covenant is a living contradiction. Organized (well, semi-organized) multiversal religion espousing atheism, and claiming that religions are bad. Mostly due to them branding certain actions as bad - for example murdering your opponents - and thus limiting your inborn freedom to strive for the greater power and influence through any means necessary. It is of little surprise that its headquarters are in Gehenna, although 'headquarters' are a bit of a stretch since every demon lord will consider himself to be the top dog in the Covenant.
Ashen Covenant tends to wholeheartedly agree with every way of striving to the top (and if you failed, then it means you were weak), but other ways of gaining support from your demonic overlords is to do things that will spite religions (such as desecrating altars and holy places, corrupting the faithful, etc.) or generally understood order (such as countries). They aren't particularly picky on that field, and will try to mess up even with the decidedly evil gods - after all, power is gained through thievery, conquest or schemes, and not by asking someone to give it to you - and evil countries.
The demon lords of the Covenant aren't above acting like gods, though - they will offer their followers power, for example. In fact, the demon lords de facto are incredibly powerful demigods, although their antitheistic approach is recognized by the System (who classifies them as demon lords, doesn't offer them an option to go full-god, but treats them the same otherwise). However they will share their power through pacts demanding certain actions that further the goals of their overlord - for example a demon lord might allow you to cast certain amount of demonic magic or summon his lesser servants in exchange for every desecrated holy place, murdered clergy, etc. Sacrificing captives to trap them forever as the husks forced to serve their demonic overlords in Gehenna is rather common form of 'payment' as well.
It should be of no surprise that followers of the Covenant are pursued and eradicated almost everywhere outside of Gehenna. It should also be no surprised that majority of the ascendant pantheons considers them to be their archenemies.
Primal Song is even more decentralized and not so-civilized variant of the typically more civilized (or anti-civilized) Cults of the Ascended. It works on mostly the same way as the Cults - namely, majority of its ranks are demigods and gods that were former humans - but with a notable twist at the point.
This religions follows a handful of Powers known as the Primal Lords. Their lists includes deities of elements (so expect Powers such as the Primal Lord of Fire, Primal Lord of Water etc.), deities of nature (Primal Lord of Leaves, Primal Lord of Fangs), and so on. Their worship is especially common among the elementals and among the more primitive civilizations, for reasons rather obvious.
The way in which Primal Lords are portrayed seems to vary between their local cult, from being almost malevolent to almost benevolent. Mostly, however, they are described as morally neutral and detached from the issues of the world. The worship tends to focus on their sattelite gods and demigods, but not without paying at least some attention to their overlords.
Terminal Sun is a relatively fringe religious belief that is officially forbidden in majority of the Multiverse, but tends to operate openly in at least some places (as a result, it's not being counted among the 'universally forbidden' proscribed cult listed beneath). They are, in an essence, worshippers of death. Or, to be more exact, undeath.
They follows the doctrine stating that the Black Sun of the Terminus is actually a form of a deity, or at least a small hole through which some greater deity is looking at the Reality while sending outs its blessings of undeath. It isn't an organized religion, but it's pretty common throughout the multiverse and follows a more or less united doctrine.
It's followers (including overwhelming majority of the sapient undead) believe the eternal undeath to be a blessing, and are willing to share it with others - with the willing converts becoming sapient undead, while the unwilling turning into mindless undead thralls. On the other hand, there are also those followers of the Black Sun that are against forced conversion, believing that in time, all life will understand the wisdom of the Black Sun.
Oneiric Choir is another relatively fringe religious belief concerning a star of a particular world - in this case the one over the Abyss, the home of the Aberrants. It appears to be somewhat organized, although with its upper ranks dominated by eldritch abominations it's really hard to say how exactly. It could as well just be an union of similar-minded eldritch abominations.
The core belief of the Choir is that the Abyss itself is a lifeform of magnitude that begets understanding, of which the star and the planets are merely small parts of. With the 'screams' audible when the star is looked at being a soothing song to those capable of understanding it - so, followers of this religion (and the Abyss itself). It is not yet born, however eventually it will be - and when it happens, it will devour and remake the universe in its image.
The followers of the Choir believe that by acting in certain ways (and worshipping the God-To-Be) they can influence the 'its image' part, while also allowing themselves to partake at what essentially is going to be the aberrant version of Paradise. The fact that it includes lack of death, lack of hunger and eternal existence has as much to do with the remnants of human morals and memories among many Men of Black, and with the fact that no threats and enough food is pretty much every lifeform's goal (regardless how weird it is).
It was originally a fringe belief even in the Abyss, at least until its followers started developing particularly strange powers and received their own character classes (whose 'quirks' ended up the Song to be sometimes referred to as 'Highmost with tentacles') - with some claiming that the God-To-Be is close enough to birth to began shaping Reality, and in a way proving that the Song has managed to influence it. Now it is estimated that approximately one in fifth abyssal posthumans are Song adherents. The rest of the multiverse is really conflicted about that fact.
Proscribed Cults are fringe 'religions' following entities that failed to find popular recognition, and tend to not be tolerated among the 'civilized' folks. You can expect them to be hiding in caves or fold spaces of their powerful leaders/protectors, do a lot of generally edgy things, and either tearing down the very concept of civilization around them or get promptly cleared out by adventurers or the local militaries.
The list of entities that ended up being worshipped by such cults includes:
Dark Lords - A proof that Mankind is sometimes rather stupid. There are cults following the Dark Lords, the now mostly dead entities that once tried to exterminate all Mankind. Its followers tend to be edgy, omnicidal, genocidal, extremely ambitious (in stupid way) or naive enough to convince themselves that Mankind slandered the Dark Lords after defeating them.
Black Archons - Certainly negative off-shoots of the Temple of the Seven. Includes such charming fellows as the Broken King (god of destruction and malice), Rapturous Storm (god of mindless ecstasy and hedonism - especially self-destructive) and the Hungry Void (god of refuting existence to the point where you manage to refute yourself into never existing in the first place).
Beyonders - For reasons unknown, any religious cult mentioning some form of Lovecraftian 'things' from beyond the multiverse was squashed out by the Dominion with extreme prejudice. This treatment remains to this day (although few know why, as the Mirror World incident was consigned to oblivion together with the Dominion's plans of finding more worlds out there), especially as some of those cults appear to have started using some really weird magic.

Religions

Major

Church of the Highmost
Temple of the Seven
Cults of the Ascended

Minor
Old Faiths
Ashen Covenant
Terminal Sun
Oneiric Choir
Primal Song

Proscribed Cults
Dark Lords
Black Archons
Beyonders