yeah it is, they even have catholics (they call them shi'ites). Same deal: worship the invisible man, follow the rules, be nice, go to heaven.
No, not really, when so much of Islam is rooted in the mores and customs of Arabic tribesmen that you can't really seperate one from another. Indonesia may be the world's largest Islamic country, but Islam's practices have nothing to do with Indonesia. Christianity, for better or worse, adapted as it expanded, absorbing other people's holidays, customs, and practices. (Ask Nuke about it, he ranted on the subject as it relates to Christmas once.) Islam did no such thing.
If Christianity had insisted on practicing mass in its original langauge, Vatican 2 would have been to change the langauge from Aramic, not Latin. Nobody has argued about being unable to learn of the Bible in its original (or rather, not original but official) langauge in several hundred years, but many are the scholars of Islam who will claim the Koran can only be read in Arabic.
Just to top it off, the whole system was set up under the assumption of temporal as well as spiritual power, as Mohammed had both. This is not the case, and Islam has not handled this well, as it lacks mechanisms to police its orthodoxy without the use of the government.