Islam really isn't a rip off of Judiasm. The only thing even remotely close to it is the concept of monotheism.
It has pagan origins [allah is the arabic name for 1 god, who was the greatest of the 365 gods of arabian paganism. Original name is il-Ilahi and he was the god of war, spear, and arrow], but theologically it is a heresy of Catholicism.