It's up to Us actually. We set the rules businesses have to follow. We set some for churches as well.If a Christian business person was so genuinely devout in his religious belief that doing business with a gay person was absolutely forbidden by his faith,
he wouldn't do any business with anyone that he could not determine with reasonable certainty was not gay.
I guess that's up to him. Or should it be up to you?
Of course. Majority rules! Everything. Even our personal preferences. Nice.