This conflict hasn't been going on for 2,000 years. It started in the early 1900's when the Zionist movement brought an influx of Jewish immigrants looking to establish a homeland in Palestine. Things were rocky from the start, but it became even worse post-WWII in 1947 when the UN & Britain hacked up Palestine to create Israel. Yes, Palestine is mostly Muslim and Israel is mostly Jewish, and religious tensions certainly don't help matters, but at it's heart, it's a land dispute that's been going on roughly 100 years at most (though 70 years might be a more apt description).