I think it's safe to assume that homosexual nonbelievers (or whoever) place equal value on a day off.

I don't see CFA ever changing their "closed on Sundays" principle. They've got as much business as they can handle the other 6 days of the week. I've never been to a CFA that wasn't packed, at any time of the day. The busier ones have the double drive throughs and still have cars backed up to the street.