Hey so, you could very well just skipped past this. You waste less time and energy doing that than commenting. You need to realise that some things are just hot to some people, and those things are liable to make you uncomfortable, and there are things you can do to avoid them, much unlike what you're doing right now.
And who knows? There might be gay porno books about other religions. This certainly isn't the first erotic work featuring religion, and it certainly wouldn't be the last. Christianity is a popular theme in many erotic works because of the religious guilt, trauma and taboo surrounding anything having to do with desire, lust, etc. This 'fetishising' might be a trauma response, or not. It's very well known that taboo topics becoming guilty pleasures after a certain while.
Furthermore, there's a subtle difference here with the religions as they're all consumed differently, which may explain the ease in having christian themes in certain erotic works = different reactions/behaviours;
ANYWHO. Why not? Why not make a work like this? As long as it's safe for the people it's meant for as well as the author, who are you to police anything? If it bothers you, simply curate your business and move on.
I will never understand why people will make religions into these kind of things.. why would you take something that’s so scared to someone and sexualize it? Why , what in your body is forcing you to do this? I’m not gonna go and say I wanna write a GAY PORNO book about a Muslim person or a Buddhist person. There’s something sickening about people who fetishized religion; it’s honestly so disgusting; not only is it weird as well but this is mockery and blasphemy..I hope you find help. God bless and Jesus loves you.