You're gonna have to prove that one too me. Can you site case law on that one?
You can refuse entry to anyone, its when you give a reason you can then fall foul of discrimination
Two Christian cake bakers in the UK got fined for not making a cake for a gay couple because they gave the reason that their beliefs would not allow them as homosexuality was wrong in the eyes of God.
They gave a reason, they should just have said they were too busy.
although they should be able to not make a cake for a gay couple if thats what they believe, seems homosexuality is protected but freedom of religion isn't, thats if you are a christian and not muslim of course.