If a religious person cares to comment on the fantasy I read I will usually gently shut them down fairly fast by making comparisons between their book and mine, both tend to require suspension of disbelief and I know mine is fantasy.
When someone starts throwing words like satanic, devient, trash etal you can guide the conversation into 'oh what should I be reading then?' before using the arguement above.
Except the satanic the satanic one is great thats a 'you really are an idiot to believe what the controlling idiots said about everything they don't like, can't explain within their narrow viewpoint or are uncomfortable talking about. You need to read some books'