Other not so peace-loving Muslims.
Muslims are in much greater danger from other Muslims than they are from any adherents of any other ideology on earth.
Failure to pursue the goal of a world-wide Caliphate with sufficient zeal is a crime punishable by death throughout Islam. Failure to agree who should be in charge of this world-wide Caliphate is also punishable by death.
Do not mistake Islam for a religion, It is an ideology, much like that described in "Mein Kampf" or "Das Kapital". The religious trappings are camouflage. They are in no way compatible with the other "great religions" of the world.
People don't have much trouble hating Scientology, now do they? Well, Scientology is a much more rational practice of faith than Islam. At least, it sticks to a certain consistency, if a foolish one. Islam is self-contradictory and dedicated to the exploitation of chaos.
Gotta love hypocracy...