So why do these homosexuals insist that they're the other sex when they're not? The answer is simple. Homosexuality deviates from God's design. You're born a man or you're born a woman stick to what you're born as. The problem is that homosexuality is utter rebellion against God. They think those against them have a psychological disorder but they're the ones. They see their bodies are obviously designed as either male or female but they still choose to go against God's design. Now who's being unscientific? Those who say that men and men and women are women or those who want to go against the laws of nature as ordained by God?
The problem of homosexuality as a psychological disorder is nothing new as it has been a problem that existed ever since Adam and Eve sinned. Romans 1:18-32 really speaks how man's mind and heart are so degenerate a corrupt. If there's really the homosexual gene then that really further proves sin is no fantasy word. People do sin because they're genetically sinners and this corrupt DNA was inherited ever since Adam and Eve sinned. Being born a sinner is no excuse to be unsaved. It's the best reason why you need to get saved and to be delivered. Homosexuals may just be using the "homosexual gene" as an excuse to remain in their sins. But they still see that their DNA is either male or female but still they refuse to conform to God's design and purpose.
Christians still need to be sympathetic to reaching out the lost. It doesn't help to be a hater. As much as homosexuals need to be warned about what they do and be confronted about their sin, it doesn't help to preach without love. Christians are called to judge sin but not the final fate of sinners. The whole battle against homosexuality is called to warn homosexuals in love and not in hate. But the problem is they're so blinded they choose to go astray.