Religions USA should NOT allow into the country
If you're thinking of banning Islam, you should also ban some versions of Christianity.
Ban Christian Bible colleges offering degree and post grad qualifications unless their degrees are authenticated and overseen by a state or mainstream university.
Ban pastors from leading, whether paid or voluntary, unless they have proper authentic pastoral qualifications.
Ban any religion that advocates violence as a primary means to achieve its own objectives.
Shut down any church that does not have proper policies to protect its members, especially children, from abuse.
Ban JW's as they operate a non-co-operation policy with the state.
Ban secret societies.
Ban all religions that teach pacifism. Again, everyone should co-operate with the state, which provides them with security and stability (one hopes). Conchies should be allowed to work in non-combattant services in case of war but in that case they should work for twice as long.
As examples.
I'm not suggesting doing any of this. Just saying that if you are going to ban Islam then you need to do this as well.