> Are they allowed to do that ?
Yes, they are. It’s called “Freedom of Speech” and “Free Exercise of Religion”.
Read about it in the First Amendment of the U.S. Constitution.
Watch what happens if you try to stop them. CAIR will call the ACLU and you will find yourself in court.
However, the First Amendment no longer applies to Christians.
Don’t believe me? Try to exercise your First Amendment rights in the “wrong” neighborhood, or within 300 feet of an Abortion Slaughterhouse, knowingly or unknowingly, and you will find yourself in court.