As a person who isnt Religious anymore, but previously Christian, and has nothing against Religion, but dont like it being pushed down on People i'd love to put my input..
Before I get far, the point of this isnt to say its a bad idea, actually I think if its though out properly it could be great, and theres certain stories I know a lot of People would actually be interested in, within Christianity.
But as others say make sure the game isnt created to try and coherse or convert People to christianity, People want to play a game and enjoy it, not be convinced that Christianity is the way of life, therefor as I can see someone had an idea of the Garden of Eden which is actually a brillant idea, but instead of not much gameplay for example epict a game of the real event from the bible, how Eva was convinced to eat an Apple, or change up on it a bit as you want, remember not everything has to be literally correct and its all about catching peoples eyes.
I know theres a lot of Christian folks out there, even gamers, but it would be good for you to catch eyes of People who isnt Christian or religious at all for that matter, and bring success that way, its all about finding the right tone, but im sure it will be tough