How is it a false premise?
The Bible clearly states that the act of two people of the same gender is abominable in the eyes of God.
.....The act of two people of the same gender is abominable in the Bible because the Bible was written by MEN, they projected their heterosexual bias onto their God concept.
Gay people, for the most part, don’t care about your convoluted Bible! They just want to be able to be married and enjoy the same legal protections and social qualities that heterosexual couples enjoy.
"When modern man wonders at the presentation of so much in the scriptures of different religions that may be regarded as obscene, he should pause to consider that passing generations have feared to eliminate what their ancestors deemed to be holy and sacred. A great deal that one generation might look upon as obscene, preceding generations have considered a part of their accepted mores, even as approved religious rituals. A considerable amount of religious controversy has been occasioned by the never-ending attempts to reconcile olden but reprehensible practices with newly advanced reason, to find plausible theories in justification of creedal perpetuation of ancient and outworn customs". UB
Leviticus 21
9 " 'If a priest's daughter defiles herself by becoming a prostitute, she disgraces her father; she must be burned in the fire.
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Time passes
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John 8
1But Jesus went to the Mount of Olives. 2At dawn he appeared again in the temple courts, where all the people gathered around him, and he sat down to teach them. 3The teachers of the law and the Pharisees brought in a woman caught in adultery. They made her stand before the group 4and said to Jesus, "Teacher, this woman was caught in the act of adultery. 5In the Law Moses commanded us to stone such women. Now what do you say?" 6They were using this question as a trap, in order to have a basis for accusing him.
But Jesus bent down and started to write on the ground with his finger. 7When they kept on questioning him, he straightened up and said to them, "If any one of you is without sin, let him be the first to throw a stone at her." 8Again he stooped down and wrote on the ground.
9At this, those who heard began to go away one at a time, the older ones first, until only Jesus was left, with the woman still standing there. 10Jesus straightened up and asked her, "Woman, where are they? Has no one condemned you?"
11"No one, sir," she said.
"Then neither do I condemn you," Jesus declared. "Go now and leave your life of sin."
Caino