Like it or not so is homosexuality.
Most Christian churches outside of the catholic church, recognize divorce.
And in doing so ignore Jesus's teachings in Matthew and Mark.
Dating someone else after divorce e is NOT, REPEAT. NOT adultery.
Marrying someone after divorce is. Or so Jesus taught us.
This is not about whether being gay is legal. It’s about whether a Christian can refuse to offer their services at gay weddings, birthdays etc, which inevitably exhibit disgusting, abhorrent, depraved behavior.
You are the one who introduced adultery into a very straightforward matter.
Bottom line, almost all Christian churches in this country outside the Catholic church recognize divorce and have done so for eons. Ergo your adultery analogy is moot. It doesn’t apply. I am quite sure the founders of the Methodist Church for example know the bible a beck of a lot more than you do, and are fully satisfied that divorce is consistent with Christian beliefs. Something that homosexuality is definitely NOT.