Did you notice that in Genesis it doesn't say "God made them male and female, and nothing else"? Also, we would agree that God made all animals and plants, right? Including snails and fish and other creatures that express sexual fluidity, yes?
I don't think you have a biblical argument, I think you have a personal opinion that you want to force upon Scripture in order to create a semblance of divine authority.
The natural order of creation presents us with a deep complexity of living things. Human beings, as part of the natural order, are very likely to also be complex.
Scripture never says "there is only male and female". That isn't a biblical claim. It is also a claim that is contrary to observed reality where it is obvious that not everyone and everything fits.
If we take the Bible seriously, if we take God's Revelation of Himself in Jesus Christ seriously, if we take our religion seriously, how can we ever justify turning toward our neighbor and say, "Your existence is wrong, you shouldn't exist."?
And that is exactly what is happening. "You shouldn't exist". It's not saying "All have sinned and fallen short of the glory of God", it's saying, "You are, yourself, wrong, a mistake, something that shouldn't exist." That's not calling sin sin, that is itself sinful--it is denying in my neighbor the Divine Image. And what does Scripture say about this?
"So also the tongue is a small member, yet it boasts of great things.
How great a forest is set ablaze by such a small fire! And the tongue is a fire, a world of injustice. The tongue is set among our members, staining the whole body, setting on fire the entire course of life, and set on fire by hell. For every kind of beast and bird, or reptile and sea creature, can be tamed and has been tamed by mankind, but no human being can tame the tongue. It is a restless evil, full of deadly poison. With it we bless our Lord and Father, and with it we curse people who are made in the likeness of God. From the same mouth comes blessing and cursing. My brothers, this should not be so." - James 3:5-10
And concerning the Divine Commandments of God, what has the Apostle written?
"For you were called to freedom, brothers. Only do not use your freedom as an opportunity for the flesh, but through love serve one another. For the whole Law is fulfilled in one word: 'You shall love your neighbor as yourself.' But if you bite and devour one another, watch out that you are not consumed by another." - Galatians 5:13-15
To despise my neighbor is not of God, that is my flesh. That is the "law of sin that dwells in my members" (Romans 7:23).
Here is a gross distortion and perversion: That we who have been called out of the darkness and into the marvelous light of Christ, to deny our flesh, take up our cross and follow Christ should betray Him, and fight against the Holy Spirit, by doubling down in our flesh to despise others, to treat others with cruelty, to hold grudges, to slander, and to think evil thoughts of others in our hearts.
Thus the finger of condemnation turns toward us, and the Law condemns us as sinners. Telling us to repent, to confess our sins. St. John reminding us, "If we say we have no sin then we deceive ourselves and the truth is not in us, but if we confess our sin then God is faithful and just to forgive us our sin and cleanse us from all unrighteousness."
Great is our sin.
Greater still is God's grace.
The Penitential Prayer:
"Most merciful God, we confess that we have sinned against You in thought, word, and deed, by what we have done, and by what we have left undone. We have not loved You with our whole heart; we have not loved our neighbors as ourselves. We are truly sorry and we humbly repent. For the sake of Your Son Jesus Christ, have mercy on us and forgive us; that we may delight in Your will, and walk in Your ways, to the glory of Your Name. Amen."
Lord Jesus Christ, Son of God, have mercy on me, a sinner.
-CryptoLutheran