No, the real religious stuff in Symphonia is not presented as fake. They do sort of have a fake Christian-like religion, but that's not what I am talking about. The summon spirits, world rebirth, Tree of Life, Niflheim, the dual-world system: its all Norse religious stuff.
Riviera has that too. There are gods, angels of destruction, a heaven and an underworld, seven sages filling in for the deceased/sealed gods, and more. In fact, none of the characters are human. One is an angel and the rest are sprites.