The problem with having Christianity in a DD game is the DM is not likely to be able to depict God in a way that is satisfactory to all players . You could have a monotheistic religion similar to Christianity , but I think people would be more offended if you were playing God in game than a fictional deity . In Forgotten Realms , there is one creator god who created the other gods , named Lord Ao , but nobody worships him . He is the one that puts the gods in their place when they get out of hand . I ' m Christian and I have Christian players in my group . The only thing you might be worried about is that sometimes your players will do terrible things in game that you never expect . I don ' t allow evil PCs , although I do allow neutral ones . If their alignment shifts to evil I will make them an NPC under my control and they may or may not become a villain depending on the circumstances . I haven ' t had to do that yet but it ' s come close .