As a cis American, here are my own thoughts. The KKK is technically a church.
They could argue that referring to black people as the N word is part of their religion and they are entitled to do so at their place of emolument. This is of course hate speech, and not protected under law.
Similarly, no one should be allowed to use hate speech towards their patients, customers, or anyone and claim it’s part of their religion. This includes trans people, who, are of course also people, a fact many people seem to forget.
Religion is fine, hatred and discrimination, is not. And any religion that encouraged you to invalidate someone else’s right to exist, or promoted hate, is probably not a healthy religion.