My Political Science major finally comes in handy
This is the age of social media and individuality where everyone is happy to espouse their special unique view of the world. The hold of religion and its leaders is eroding. We can't buy into peoples' affiliations as defining them anymore. We have gay Republicans and conservative Democrats. We have 3pt shooting PFs and post-banging PGs (just trying to tie basketball back in).
Personal beliefs direct everyone's personal decisions.
A person's faith is included in that, however, there is a difference between being guided by faith and imposing religion. We know that the latter won't happen. It's written in our constitution and we have 2 other branches that balance the executive. Any laws on religion would be thrown out by the Supreme Court without delay.
If we're talking about an executive order or some form of intervention, you'd have to describe for me a bit further what we're talking about. I really see nothing that would prevent a Muslim president from running this country in a similar way to Christian counterparts aside from not serving pork, drinking alcohol, gambling, ect. Does that mean those things would be outlawed? Of course not (the president just wouldn't be seen at a bar or casino

). Congress would never pass such laws and I doubt anyone who would emerge as a serious contender for the presidency would offer such legislation.
Fun Fact: the older we get, the more conservative our beliefs and vice versa - younger = more liberal