The issue is unilaterally banning people because of their associations with any given religion.
If Islam is a religion then so is Nazism and the Klan.
Muhammad was a warlord, pedophile, rapist pig. Islam, by definition, worships this man as the greatest spiritual leader to ever live.
There is no more one needs to know about such a toxic ideology.
And there is no excuse for supposedly enlightened, freedom-loving Westerners to defend such disgusting sewage.
Love your enemies!