If Israel didn't exist, we'd still have a presence there for one simple reason: oil. And they would still have a beef with the U.S., and the Saudis would still exploit their people, and support terrorism, and this war would still be in danger of spiraling out of control.
That is not and is very unlikely ever to be the official policy of hte government of the United States.
We are not about to dump our Muslim allies. We are not going to fight one billion Muslims.