[@Antarctic Termite] As we're discussing existing religious practices:

Elysium Worship on Arcon: We know Arconians worship Elysium to the exclusion of all others, but other than the Eskandars we don't have details.

Eskanadrian Elysium Worship: Followers of Eskandar worship Elysium, who is known to them as 'the Moon-Mother'. They follow in the footsteps of a Prophet-Patriarch called Eskandar. His death and subsequent politics means that understanding of the religion has undergone radical interpretations and re-interpretations as time went on, to be discussed in planned post mentioned above.

Vowzra's Victors and Inhabitants of New Chronos: Generally, all the inhabitants of New Chronos worship Vowzra, Belruarc, Illunabar, Belvast, and the Bard. They recognise the existence of the other gods and demigods but do not worship them. Their beliefs have been explored somewhat in previous Vowzra's Victors posts.

Pronobii Reathos Worship: The Pronobii are extinct on Galbar, but are extant on New Chronos. Along with the orthodox religion of the other inhabitants, the Pronobii here also worship Reathos. This has not been canonised, but is implicit due to pre-existing canon regarding Pronobii religion.

Treemind Life Worship: Treeminds worship an abstract entity called 'the Life'. It is not clear what has happened to this religion after their exodus to New Chronos.

Thulemiz and Friends: It's not really a religion, as only Thulemiz seems to follow it, but he seems to glorify Death in an abstract way, removed from its embodiment in any god or whatnot. This will probably develop as he gains more of a following and grows in power. But as he sees (or will eventually see) himself as the manifestation of the beauty of death, it will become something of a self-worship thing for him, and him-worship thing for others. Distinct from a God-Emperor like Lifprasil in the sense that Lif doesn't worship himself, but others worship him.