Lemon:
Most religions believe in the same basic concept. Be good and be good to the people around you, we just go about it in different ways. So any future religion is bound to be a reworking of that idea unless we go all Mad Max post apocalyptic in which case to meet those needs a religion may crop up built around a different idea.
Or... A dragon with 5 sets of wings had sex with a lizard made of water and 9 months later the universe popped out , umpa lumpa's for prophets or something. The doctrine/ideas/laws and all that will probably be more or less the same, true.