Joe Grundy: " If religious freedom (including freedom from religion) is the norm, how could a 'Muslim ban' be contemplated, when 'Muslims' are just adherents of Islamic religion in one of its many forms?"
In US politics, "Muslim ban" is code for "Brown-people ban". Saying it's about religion allows the racist segment to openly support the policy without being called racist. However, there are some true-believers who think everyone should be Christian. You can tell which they are by asking if they think all other religions/denominations other than theirs should be banned too.