There is one very common denominator that muslims can, will, and are united about, hatred for Israel and the west. Just as love is an extremely powerfull emotion, it's direct opposite, hatred is equally as powerfull. It's that ame hatred that has gotten us to this point and is fomenting whether manifested or not in the heart of most evey muslim. Time is coming to choose sides, what side do you think thier going to take whether directlu involved or not? Certainly not the Israeli's, hence they are are united.
Okay, for the sake of argument, let's say the Muslims are united in their hatred for Israel. I don't necessarily think that all Muslims hate Israel, but for the sake of this argument, lets pretend they do. Let's say they band together and succeed in defeating Israel and Israel no longer exists. What happens then? How long before the tribal infighting destroys Islam? Weeks? Months? Years?
The majority of Muslims indeed hate Israel, but not all Muslims do. They can't even all agree on what the Koran says. Islam is far, far from being united and IMO it never will unite for any cause, includig Israel, because of deep internal divisions. (thank God)