"The basis of Mongol antagonism with Islam was not religious but the fact that the Muslim faith produced poor behavior among its followers - and that the (usually tolerant of religions) Mongols could not tolerate."
And THAT is the rub.
Islam is NOT just a "religion". Its a social, cultural and political system which tolerates no other beliefs.
Witness what is happening with our "friend and ally" the new government in Afghanistan.
ditto