Actually the ten Muslim kings are tired of the little horn beating up on them all the time.They really hate Israel.You don't call the Vatican the little horn, but you still claim the authority is the Vatican, and not Jerusalem. Hardly any difference.
Jerusalem is the city of power and influence that the 10 future individuals will go through and cleanse away every human religious connotation, to leave pure satanic devotion as being the only acceptable worship.
This is not just about one single religion. This is the end of all religions.