Most as literature curios to me, but the concepts of greek gods, possibly the first concept of the supernatural I was exposed to, I always found very entertaining and interesting. Echoes of that in Germanic religious tradition. ("It's a German legend, there's always going to be a mountain in there somewhere..."
I found a similar, interesting polytheistic balance in most European pagan traditions, some that continue to this day. And following that, I enjoyed the much more rich and diverse landscape of indigenous Americas' religions.
I found deism utilitarian, and understandable/approachable, and ultimately much more fitting with my then-observations of a world that seemed impossibly complex, but utterly abandoned by anything that might allegedly have created it, but I also found deism much less interesting than the various polytheistic traditions.
A complete aside, but I encountered discordianism much later in life, having discovered it through treatment of Eris as a running allegory in a Star Trek book, and then went fishing beyond the book to see what it was all about. (I believe From The Depths was the specific book, "Laughing radiation, Eris struck the limb of the world alight" (Eris being the name of Discord's sun))
I guess I've always found polytheistic compartmentalization of gods as characters, with different personalities and abilities the most interesting. Always the most interesting stories accompany the concepts anyway, the hero overcoming godly opposition, gods making moves and counter-moves, intrigue and strife between, some seeking to elevate humanity, others seeking to destroy or debase. All of this an influential source of literature that I devoured as a kid. Most certainly.