Passages in both the Old and New Testaments condemn homosexual behavior and gender confusion, and affirm marriage as being one man and one woman.
Genesis 19: 4- 13 -- 4 Now before they lay down, the men of the city, the men of Sodom, both old and young, all the people from every quarter, surrounded the house. 5 And they called to Lot and said to him, "Where are the men who came to you tonight? Bring them out to us that we may know them carnally." 6 So Lot went out to them through the doorway, shut the door behind him, 7 and said, "Please, my brethren, do not do so wickedly! 8 See now, I have two daughters who have not known a man; please, let me bring them out to you, and you may do to them as you wish; only do nothing to these men, since this is the reason they have come under the shadow of my roof."
9 And they said, "Stand back!" Then they said, "This one came in to stay here, and he keeps acting as a judge; now we will deal worse with you than with them." So they pressed hard against the man Lot, and came near to break down the door. 10 But the men reached out their hands and pulled Lot into the house with them, and shut the door. 11 And they struck the men who were at the doorway of the house with blindness, both small and great, so that they became weary trying to find the door.
12 Then the men said to Lot, "Have you anyone else here? Son-in-law, your sons, your daughters, and whomever you have in the city-take them out of this place! 13 For we will destroy this place, because the outcry against them has grown great before the face of the LORD, and the LORD has sent us to destroy it."
Leviticus 18:22 -- You shall not lie with a male as with a woman. It is an abomination.
Deuteronomy 22:5 - A woman shall not wear anything that pertains to a man, nor shall a man put on a woman's garment, for all who do so are an abomination to the LORD your God.
Deuteronomy 23: 17-18 -- 17 "There shall be no ritual harlot of the daughters of Israel, or a perverted one of the sons of Israel. 18 You shall not bring the wages of a harlot or the price of a dog to the house of the LORD your God for any vowed offering, for both of these are an abomination to the LORD your God.
1 Kings 15:9-13 - 9 In the twentieth year of Jeroboam king of Israel, Asa became king over Judah. 10 And he reigned forty-one years in Jerusalem. His grandmother's name was Maachah the granddaughter of Abishalom. 11 Asa did what was right in the eyes of the LORD, as did his father David. 12 And he banished the perverted persons from the land, and removed all the idols that his fathers had made. 13 Also he removed Maachah his grandmother from being queen mother, because she had made an obscene image of Asherah. And Asa cut down her obscene image and burned it by the Brook Kidron.
Matthew 19:4-6 -- 4 And He answered and said to them, "Have you not read that He who made them at the beginning 'made them male and female,' 5 and said, 'For this reason a man shall leave his father and mother and be joined to his wife, and the two shall become one flesh'? 6 So then, they are no longer two but one flesh. Therefore what God has joined together, let not man separate."
Romans 1:24-27 -- 24 Therefore God also gave them up to uncleanness, in the lusts of their hearts, to dishonor their bodies among themselves, 25 who exchanged the truth of God for the lie, and worshiped and served the creature rather than the Creator, who is blessed forever. Amen. 26 For this reason God gave them up to vile passions. For even their women exchanged the natural use for what is against nature. 27 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.
1 Corinthians 6:9-11 -- 9 Do you not know that the unrighteous will not inherit the kingdom of God? Do not be deceived. Neither fornicators, nor idolaters, nor adulterers, nor homosexuals, nor sodomites, 10 nor thieves, nor covetous, nor drunkards, nor revilers, nor extortioners will inherit the kingdom of God. 11 And such were some of you. But you were washed, but you were sanctified, but you were justified in the name of the Lord Jesus and by the Spirit of our God.
1 Thessalonians 4:3-6 -- 3 For this is the will of God, your sanctification: that you should abstain from sexual immorality; 4 that each of you should know how to possess his own vessel in sanctification and honor, 5 not in passion of lust, like the Gentiles who do not know God; 6 that no one should take advantage of and defraud his brother in this matter, because the Lord is the avenger of all such, as we also forewarned you and testified.
2 Peter 2:6-10 -- 6 and turning the cities of Sodom and Gomorrah into ashes, condemned them to destruction, making them an example to those who afterward would live ungodly; 7 and delivered righteous Lot, who was oppressed by the filthy conduct of the wicked 8 (for that righteous man, dwelling among them, tormented his righteous soul from day to day by seeing and hearing their lawless deeds)- 9 then the Lord knows how to deliver the godly out of temptations and to reserve the unjust under punishment for the day of judgment, 10 and especially those who walk according to the flesh in the lust of uncleanness and despise authority.