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plural noun: genes
1.(in informal use) a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
2.a part of a cell that controls or influences the appearance, growth, etc., of a living thing.
Different genes are found in human beings, these genes determine if we get our mother's eye colour, or maybe our fathers hair type, or our skin tone, our nose size, etcetera etcetera etcetera.
Who created genes? Being that genes are a part of our dna and cell structure, which are found in us from birth, and being that God created man, not some intergelactic burst in the atmosphere, it's safe to say that the genes which are found in us are a result of God's handiwork, as is the rest of the human body. With that being said, if someone says that there is a "gay gene" they are directly saying that God went ahead and placed in many of His creations a gene that would cause a person to participate in what is Biblically described in the book of Leviticus 18:22-30, Romans 1:26-32, as shameful, unnatural, abominations and perversions. And participating in such acts would make a person ineligble to enter the Kingdom of Heaven as mentioned in 1 Corinthians 6:9-10. All of that would be saying that God went ahead and placed something in humans that would make them do exactly what He commanded us not to do. Also, that would be saying there is unrighteousness or wickedness with God, but there is no unrighteousness with God as explained in Romans 9:14 and Job 34:10-13.
If someone was to relentlessly purport this thing about a "gay gene" existing and being the cause for gay people being gay, how much differnt would that be from saying there is an adultery gene, a fornication gene, a sodomy gene, a gene that causes one to masturbate, a gene that causes one to lust? I doubt many people would take, "it's my adulterous lust gene that made me cheat on you" as an excuse from a spouse. So, why would anyone truly go around affirming or even suggesting it may be possible for there to be a "gay gene"?
All of that would be ridiculous, all of those lies simply are there to take direct attention from what it is that truly causes (all) of those acts, and that is sin.
We must be very careful with the things we go around saying, specifically those who are calling themselves Christians. These damnable heresies are taking many persons captive, who are determined to exhange the truth of God for the lie as mentioned in Romans 1:24-25.