A billboard saying God hates Fags or whatever has nothing to do with any religion.
Actually, it does. We might not like that religion, but it's a legitimate creed. When it comes to free speech and religion, we must not err on the side of caution. That leads to the tyranny of censorship.
My scenario didn't say "God hates fags". My scenario was where a Christian walked in, on purpose, to a gay billboard designer and asked him to print a billboard for many major highways that says "Homosexuality is a sin unto God". God doesn't hate sinners. And you'd know that if you knew a whit about Christianity. And, all Christians are sinners. God hates the sin itself. It could even say that in subprint on the billboard.
What is the proper fine for a Black owned bar refusing to host a mixer intended to raise money for David Duke presidential campaign? Is it more or less than the fine for a hunting lodge denying to host the Christmas party of the Coalition to Stop Gun Violence? I wonder about these things.
Race has nothing to do with sexual-orientation or religious-orientation. Two completely different legal kettles of fish.
For instance, the Lovings of famous "Loving v Virginia" did not violate the one man/one woman laws of each state so their case wasn't about marriage but instead about racial discrimination. This was a mistake the USSC made last Summer. They thought the Loving case was about marriage. It wasn't. Nothing changed in marriage of one man/ one woman. And if you argue it did, then at that precise moment Loving was Found, polygamy (yet another "orientation" in love) was also legal. If you think it wasn't/isn't, then cite the 14th Amendment in your explanation of "why"..