It is difficult to exaggerate how seriously the Bible treats the sin of sexual immorality. Sexual sin is never considered adiaphora, a matter of indifference, an agree-to-disagree issue like food laws or holy days (Rom. 14:1-15:7). To the contrary, sexual immorality is precisely the sort of sin that characterizes those who will not enter the kingdom of heaven. There are at least eight vice lists in the New Testament (Mark 7:21-22; Rom. 1:24-31; 13:13; 1 Cor. 6:9-10; Gal. 5:19-21; Col. 3:5-9; 1 Tim. 1:9-10; Rev. 21:8), and sexual immorality is included in every one of these. In fact, in seven of the eight lists there are multiple references to sexual immorality (e.g., impurity, sensuality, orgies, men who practice homosexuality), and in most of the passages some kind of sexual immorality heads the lists. You would be hard-pressed to find a sin more frequently, more uniformly, and more seriously condemned in the New Testament than sexual sin.
When the Bible uniformly and unequivocally says the same thing about a serious sin, it seems unwise to find a third way which allows for some people (in a church, in an organization, or in a denomination) to be for the sin and other people to be against the sin. History demonstrates that such half-way houses do not stand. Every doctrine central to the Christian faith and precious to you as a Christian has been hotly debated and disputed. If the “conversation” about the resurrection or the Trinity or the two natures of Christ continued as long as smart people on both sides disagreed, we would have lost orthodoxy long ago.
All of these third ways regarding homosexuality end up the same way: a behavior the Bible does not accept is treated as acceptable. “Agree to disagree” sounds like a humble “meet you in the middle” compromise, but it is a subtle way of telling conservative Christians that homosexuality is not a make-or-break issue and we are wrong to make it so. No one would think of proposing a third way if the sin were racism or human trafficking. To countenance such a move would be a sign of moral bankruptcy. Faithfulness to the Word of God compels us to view sexual immorality with the same seriousness. Living an ungodly life is contrary to the sound teaching that defines the Christian (1 Tim. 1:8-11; Titus 1:16). Darkness must not be confused with light. Grace must not be confused with license. Unchecked sin must not be confused with the good news of justification apart from works of the law. Far from treating sexual deviance as a lesser ethical issue, the New Testament sees it as a matter for excommunication (1 Corinthians 5), separation (2 Cor. 6:12-20), and a temptation for perverse compromise (Jude 3-16).
We cannot count same-sex behavior as an indifferent matter. Of course, homosexuality isn’t the only sin in the world, nor is it the most critical one to address in many church contexts. But if 1 Corinthians 6 is right, it’s not an overstatement to say that approving same-sex sexual behavior—like supporting any form of sexual immorality—runs the risk of leading people to hell. Scripture often warns us—and in the severest terms—against finding our sexual identity apart from Christ and against pursuing sexual practice inconsistent with being in Christ (whether that’s homosexual sin or heterosexual sin). The same is not true when it comes to sorting out the millennium or deciding which instruments to use in worship. When we tolerate the doctrine which affirms homosexual behavior, we are tolerating a doctrine which leads people further from God. This is hardly missional leadership or kingdom Christianity. According to Jesus, it’s repentance for sexual immorality, not tolerance of it, which leads to human flourishing (Rev. 2:20-23). Christians who get this fundamental point confused are not purveyors of a liberating third way, but of a deadly and dastardly wrong way.
For more on this and other related themes, see What Does the Bible Really Teach About Homosexuality? The book releases in April.