I'm not religious myself, but I can totally understand how the inclusion of demons (especially named after those from real world religion), removes the blur between fantasy and reality for some religious folks, and drives them away from the game.
On the flip side, there's been a very popular TV show that was on Fox for three years, but is now on Netflix, titled, "Lucifer". It is about the literal Devil - cast out of Heaven, spent eons in Hell, and then quit Hell and moved to Los Angeles. It is (loosely) based on Lucifer from Gaiman's Sandman comics.
About 165K people signed petitions to have it not air back in the day. But, it averaged millions of viewers per episode.
From which we may surmise - having content that is controversial or offensive to some is not a bar to popular success. That's not a real fear. The central question is about when you choose to use such content, and when you don't.