AFAIK, no one has rights based on political beliefs. But in the US, people have religious liberty granted to them under the constitution, within some fairly loose limits, and discriminating against people in employment based on their religious requirements is not legal. There’s the issue of ‘reasonable accommodations’; if I’m Muslim, then a company denying me the ability to pray several times each shift is almost certainly religious discrimination.

Yes, I agree that we should view religion as a choice rather than an inherent quality, but that’s not the way the constitution is.