Have you not read that He who created them from the beginning MADE THEM MALE AND FEMALE, and said, ‘FOR THIS REASON A MAN SHALL LEAVE HIS FATHER AND MOTHER AND BE JOINED TO HIS WIFE, AND THE TWO SHALL BECOME ONE FLESH’? “So they are no longer two, but one flesh. What therefore God has joined together, let no man separate.” - Jesus Christ
"Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof..." - The United States Constitution
Do you have any questions?
I think if this were to be litigated the 1st Amendment route probably has the best hope.
But some more perceptive folks might ask, why are you picking on homos when you don’t pick on divorcees etc.?