Among religious people, why is it that Muslims have the hardest time assimilating to western society?

@Convivial Hindus are very different in their beliefs, but still assimilate much better .

@BittersweetPotato Hindus have multiple gods, or versions of... Plus I think their culture is more attuned to a wide variety of belief systems... Islam is very strict and very tribal and still very rooted in 12th century belief system...