It seems that most religions are dead. European paganism in whatever form you look at it is dead. You would just be making stuff up at this point. The Greek philosophical religions are long dead. Most other major religions are really folk practices and lack any universalist appeal. This probably includes Shinto, Hinduism and some forms of Eastern Orthodoxy. Buddhism doesn't really seem to be its own thing, but a set of mystical ideas since incorporated into a number of belief systems. Judaism long since ceased to be a religion and is instead the operating instructions for a global mafia organisation, with any once positive aspects of it and Neo-Platonism having been incorporated into Christianity. Enlightenment atheism was always a really evil, stupid and self-contradictory attack on organic human society and thought that is dying and will finally give up the ghost when the material wealth that supports in dissipates. That leaves Christianity and Islam.

Mainstream Islam consists of the Koran, other writings such as the Hadiths and Arab traditions. Most of the latter two are fairly silly, of no real universalist appeal and seem unable to withstand any kind of liberalist incursion. Of Christianity, Roman Catholicism is now just a bunch of perverts, hand-rubbing Jews and evildoers plundering white people dumb enough to remain to buy the allegiance of third world savages. Mainstream Protestantism was fairly silly to begin with for dispensing with a thousand years of erudition to restrict itself to something as sparse as a few selected books from the New Testament and has fallen prey to appeals to the hysterical emotions of its dimwit congregations and evil death cults such as feminism to the point where it stands for nothing and should agree to disband and join other religions. I don't know enough about the various forms of Orthodoxy to know whether anyone still takes them seriously, but I doubt it.

Yet the basic Christian traditions still remain. So your choice is basically some form of rethinking of Christianity from the beginning. The end.