Why do I say that Islam is an evil religion?

[The Grand Nudger]

Correct, harm is not identical to evil.  As I said, I think evil takes harm and malice.  

That you think you haven't harmed your spouse by cheating on her, provided she never finds out - is yet another difference between our moral views.  Boy howdy, I'm glad you might get some enjoyment out of it, though!

This devilish pleasure might be fine between men, I get this. But I am prepared to bet that many married women regard this act as horrendously evil, or maybe the most evil act imaginable.

I don't think it's fine "between men" either.  The locker room defense isn't a moral argument, lol.

Sure.  The unfaithful husband has harmed his wife the very moment he violated her trust.  Evil?  Probably not...most cheaters aren't in it to hurt their spouse.  Some are, though, and that's pretty heinous.

Again, many people will disagree with your assessment here, and indeed consider cheating (even in the absence of malicious intent) to be inherently evil. 

So?  Honestly, so what if many people disagree?  You know what I use the term evil to refer to, and so...whatever opinion you or the housecat may have on the matter, there either is or isn't malice.  Could be the case either way, like I said.  The basic difference between doing a bad thing, and an evil thing.  

But pause for a second.  Why on earth do you think any of these questions would be stumpers?  How could I stumble my way through mundane existence navigating these very real concerns without any awareness or consideration of them whatsoever?  It's absurd. 

I am aware that my example isn't exactly a knockout argument against moral realism, but at least it scratches the surface : even in the absence of harm or malice, there are acts that can properly be regarded as evil.

It's not any argument at all, and you don't really want to argue against moral realism anyway.  You foolishly believe that you can shove your silly god in there somewhere, and that without it, it doesn't make sense.  

You're just wrong, plain and simply wrong, in point of fact.