The US constitution states that no law can respect an establishment of religion as well as freedom of religion. Muslims are permitted to run for and hold office, being able to wear hijab and prayer is protected by the constitution, etc. But any laws passed cannot be religious, for example requiring all women to wear hijab. Also, if anyone tried to establish theocratic rule that overthrows the constitution and declared civil war the military would take the side of the constitution. Christian theocratic rule is a much more realistic threat to overthrowing the US constitution, which isn't done by overt war but fascism, voter suppression, etc.