This feud has been going on for thousands of years, if one wants to go to the root of it, you can read about it in bible.
It's sad how much hate and division there is, on both sides, and even among Christians, people want to take "sides." I think many Christians forget that we are supposed to love all people, even our enemies. Yes, we should hate
evil, but when it comes to people, my view is that both sides need Jesus.

I have a heart for Jews AND Muslims. And I love seeing testimonies of either Jews or Muslims coming to Christ. But I guess I'm off topic here.
As for the question of the thread, I have a theory on why. Well, it's not really MY theory, but it's something I believe. But it would take a while to explain, so I'll try to put it into writing and get back to this later.