Again, it's a private business and they can do whatever the hell they want. If you want to believe in your magical sky daddy, keep it to yourself. I always hear so much from christians who keep saying that atheists want to push their agenda, personally I've never seen anybody who is an atheist going from door-to-door to preach their ideals.

Businesses have lots of rights ( https://www.cnn.com/2019/06/17/politics/supreme-court-lgbtq-religious-liberties-oregon/index.html ).

They even don't have to accept legal tender in exchange for selling you something.

Eg. if you try to pay with $1000 in pennies they legally can refuse a sale or ask for more reasonable payment.