Religious individuals just want special rights to tell people what to do and skirt laws about providing services. They could not serve mixed-marriage couples, divorced people or people with children born out of wedlock. They are bigots, pure and simple, and the law does not support them. We went through lunch counters in the '60s. Hatred for gays is obviously very deep, and they cannot see how bigoted they are being.
The prescription is to mind your own business, and keep your religious freedom to yourself, as you are entitled to do. Do not bother others with stupidity.