I can't remember the actual break down, but religion doesn't seem to high on the list for wars starting.
Certainly, religion is just one factor.
But it looms larger than usual in this conflict.
Hitler going after Jews was appears to have been
a political tool, rather than about their religion.
But fellow German Christians bought it, & so it
became more about religion. This led to Israel's
creation as the "Jewish State", which increased
religion's role. And as we see in Israel, it has
become very very much about religion....more
so than the role of religion in the Palestinian
side of this conflict.
Did religion start it?
I say that's a question not up to the complex task.