The Biblical institution of marriage is clearly between one man and one woman. The Genesis account is the foundation of our understanding of Biblical marriage. God created a woman for the man, when he was alone. Adam named her “Woman”, declaring that she was the bone of his bones and flesh of his flesh. The scripture states:
And Adam said: “This is now bone of my bones And flesh of my flesh; She shall be called Woman, Because she was taken out of Man.” Therefore a man shall leave his father and mother and be joined to his wife, and they shall become one flesh. (Gen 2:23-24 NKJ)
God destroyed Sodom and Gomorrah because of the great wickedness in those cities. One of the wickedness practiced there was homosexuality. We get our English word “Sodomy” from Sodom. When God sent his angels to destroy that city, the men of the city, on knowing that strangers had arrived, went crazy to have sex with the men. Such was their wickedness. (Gen 19).
The Biblical Law stipulated:
If a man lies with a male as he lies with a woman, both of them have committed an abomination. They shall surely be put to death. Their blood shall be upon them. (Lev 20:13 NKJ)
Paul describes homosexuality as the result of religious corruption and mental debasement. When men exchange the truth of God for the lie of the world and exchange the worship of God for the worship of worldliness, then perversion ensues:
Professing to be wise, they became fools, and changed the glory of the incorruptible God into an image made like corruptible man– and birds and four-footed animals and creeping things. Therefore God also gave them up to uncleanness, in the lusts of their hearts, to dishonor their bodies among themselves, who exchanged the truth of God for the lie, and worshiped and served the creature rather than the Creator, who is blessed forever. Amen. For this reason God gave them up to vile passions. For even their women exchanged the natural use for what is against nature. Likewise also the men, leaving the natural use of the woman, burned in their lust for one another, men with men committing what is shameful, and receiving in themselves the penalty of their error which was due. And even as they did not like to retain God in their knowledge, God gave them over to a debased mind, to do those things which are not fitting. (Rom 1:22-28 NKJ)
The Bible tells us that homosexuals who don’t repent of their sins should not be deceived; they will not inherit the kingdom of God.
Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God. (1Co 6:9-10 NKJ)