Why do I say that Islam is an evil religion?

[The Grand Nudger]

 There is something particularly atrocious about ungratefulniess, 

There we go, see, you're a realist all of a sudden.  There's something bad about disobeying a god, and it's that it's an ungrateful act.  

I think we already reached a stalemate, it really comes down to your a prioris. In a naturalist worldview, no religious statement is objective in any way

Plenty of religious statements can be objective.  It's wholly on the religious if they choose to make statements which are not.  

 In a theistic worldview, there obviously are objective moral evils other than the plain evils like physically harming someone. 

That's not obvious at all.  For a long time, and even today, people have argued divine command shit...where nothing about an act itself is the reason that anything is good or bad.  It just boils down to the completely arbitrary positions of some silly god.  

So how to break this stalemate ? In my example about unfaithfulness, I was attempting to poke holes in the realist viewpoint : there might very well be acts that are evil and yet can't be shown to be so by appeal to objective facts. Even if I weren't religious at all, I would find it really hard to consider cheating anything below evil.

There is no stalemeate, you're a moral realist..like most people tend to be, you just happen to be an islamist too...and that compromises your rational agency.

That's why you say absurd and manifestly false shit, as you continue to do even in that post, and fling yourself into doomed arguments. You've been sold a bill of goods about western degeneracy by your fruitcake shaman, and that's turned you into a raging asshole. Sorry bud.