They weren't Americanized with their own businesses, Christian wives and kids in public school either.
I have met muslims who discount parts of their beliefs. But at some point they will come to the realization that they have discounted their religion so much as to have abandoned it, or they will toe the line. Toeing the line would include adhering to the koran.
The koran says that all infidels must be subjugated (enslaved), converted, or killed. Even if you get subjugated or converted you are still eligible for being killed. Unless and until a muslim recants their religion the threat of them adhering to these commands will always be there.
I learned this as a result of my brother informing me of work by a former muslim terrorist converted to christianity by his wife, Walid Shoebat.