God designed sex and marriage to communicate His gospel. The man leaves and cleaves. Likewise, Jesus left heaven. One man marries one woman. And Jesus is the Husband of the church. Husband and wife remain faithful to each other. In like manner, Jesus remains faithful to His church, and the church remains faithful to Him. Husband and wife unite as one in sexual union. Similarly, the marriage between Jesus and His church will be consummated upon His return and sexual satisfaction gives a taste of the joy God had in creating life. The wife submits to the husband who is her head. So also the church submits to Jesus as its Head.
Sex and marriage unmistakably reflect the gospel. We can’t have two men or two women or a polyamorous union or multiple sexual partners because we don’t have two Jesuses, two churches, or idolatry permitted in the gospel. Straying from the biblical portrait of sex and marriage changes the gospel.
Arguments for Biblical Homosexuality
Some theologians, however, argue that homosexuality is indeed moral and biblical. They emphasize that love is the greatest commandment and that God didn’t design humans to exist in solitude. They say that God created gays with homosexual attraction and that He doesn’t make mistakes. They point out that the Bible is adamantly opposed to oppression and marginalization, and they argue that Jesus commanded His followers not to judge. They equate the oppression of homosexuals with the offenses of the trans-Atlantic slave trade and the oppression of women.

Moreover, these theologians also highlight the fact that a vast majority of Scripture is silent about the issue of homosexuality. They argue that there are only about half a dozen references to homosexuality in the whole Bible. They claim that the passages against homosexuality were culturally specific rather than universal. And they recognize that Jesus never actually said anything about homosexuality. With all of this in mind, they argue that homosexuality is acceptable before God.
Arguments Against Biblical Homosexuality 
But the theologians who argue that homosexuality is moral according to God are reading the Bible through the lens of homosexuality rather than homosexuality through the lens of the Bible. It requires significant theological gymnastics to arrive at the above conclusions. In this section, we will very briefly address the flaws of the aforementioned arguments and come to a final conclusion about gay Christianity.
1. The Greatest Commandment is Love, So We Should Accept Gay Relationships
Answer: True love is pointing people to salvation. Affirming sin is condemning people to hell and the most unloving thing we could ever do.
2. It Isn’t Good For People to Be Alone
Answer: Matthew 19:12 records Jesus affirming those who choose celibacy for the kingdom of God.
3. God Created Homosexuals With Their Homosexual Attraction, So It Must Be Good
Answer: Every aspect of life has been impacted and corrupted by sin, but God does not contradict Himself. We experience sinful desires that go against His standard not because God designed us this way but because we are sinners. We must not define truth based on our feelings that are inclined to be sinful but on the Word of God that is perfect and true.
4. The Bible Condemns Oppression, So Christians Shouldn’t Oppress Homosexuals
Answer: Christians have often been guilty of sin in the way that they have treated homosexuals. But that doesn’t change the fact that homosexual sex is sin. And pointing homosexuals to the truth with grace is not oppression. It is the greatest form of love.
5. Jesus Said Not to Judge
Answer: Jesus said not to judge hypocritically, excessively, or without discernment (Matthew 7:1-6). But we are to judge correctly (John 7:24). Judging sin for what it is (without hypocrisy, proportionately, and with discernment) is good and honorable before God.
6. African Americans and Women Received Their Rights, So Homosexuals Should, Too
Answer: The Bible never approved of oppressing African Americans and women. Biblical servanthood was nothing like the trans-Atlantic slave trade. And the laws that were put into place were for the protection of servants and women. Their rights were based on the fact that they are people made in the image of God who deserve to be valued. Sex is not a fundamental human right. Everyone, gay or straight, who is not in a heterosexual marriage must refrain from sex if they want to please God.
7. Only Six Out of 1,189 Bible Chapters Mention Homosexuality
Answer: God’s Word is truth, the perfect standard of God. Mentioning a theme once means that it is important to our holy God. Mentioning it six times means that it is 6-times-important.
8. The Prohibition of Homosexuality Was Culturally Specific
Answer: Various laws and guidelines from both the Old and New Testaments are no longer observed. But we do not get to pick and choose which ones are done away with and which ones remain. In the transition from the Old Testament to the New Testament, it is important to look at repetition and reversal of themes. The food laws and ceremonial laws existed to symbolize that Israel was to be set apart from the rest of the nations. The prohibition of homosexuality was not reversed in the New Testament. On the contrary, it was repeated. And it wasn’t repeated only once. It was repeated in several different contexts. Everything the Bible says about homosexuality is negative. Without a single affirmation, it is impossible to say it is a culturally specific command.
9. Jesus Never Condemned Homosexuality
Answer: Jesus went much further than simply condemning homosexuality. He affirmed heterosexual marriage as described in Genesis (Mark 10:6), condemned all forms of sexual immorality (Mark 7:21), and deepened the understanding of marriage (Luke 16:18). This means that He condemned fornication, living together before marriage, adultery, lust, divorce, and homosexuality. Anyone who is living in open and unrepentant sin in these areas runs the risk of being told that Jesus does not know them on the final day because they are not doing the will of His Father (Matthew 7:21).
Conclusion
The Bible clearly prohibits same-sex sexual relationships. Homosexuality is immoral and sinful in God’s sight. But the Bible also clearly distinguishes between temptation and sin. Jesus was tempted in every way as us, yet He remained sinless. Experiencing homosexual attraction is a temptation that some people face, but homosexual attraction in and of itself is not sinful. 
A gay person whose primary identity is in their homosexuality and is living in open and unrepentant sin is likely not a Christian. They have disregarded the entire message of the Bible as well as God’s authority and His plan for salvation. But someone who experiences same-sex attraction and yet is actively working to submit their desires to God and resist sin can be a Christian in the same way that every other Christian comes to salvation: by denying oneself and coming to Christ in faith and repentance. Jesus indeed died to save people from all kinds of sins.
Jesus calls all of His followers to pick up their cross and follow Him. He didn’t promise that everyone would have equally fair crosses or that carrying them would be easy or fun. Many Christians have difficult sexual crosses to bear for the sake of righteousness. Some have to carry the cross of unwanted pregnancy, and some have to carry the cross of unwanted singleness. Still others have the cross of homosexual attraction or a loveless marriage or painful or unfulfilling sex within marriage or sexual abuse.
Whatever the cross and whatever the circumstance, we must submit to Jesus as the Lord of our lives. He left heaven and experienced unjust suffering, and we should follow His example as we face unfair suffering. Living in this fallen world is not easy. But we have the hope of eternal life without troubles if we submit to God’s way for our lives now, even when it is difficult.