Okay, I'll differ.
I believe homosexuality is wrong.
The simplest reason is clearly to say that the Bible says it is. And I should start there; and if I go deeper, that's good.
I think it's implied clearly and spoken clearly in and that homosexuality is wrong and to be avoided.
Now, that's just the "It's wrong, don't do it" authority answer. The question "Why would the Bible say that?" is also multi-layered.
1) The Bible sets up at the beginning that a man and a woman become one flesh. That's God's way of doing sexuality. It's a man and a woman created in beautifully complementary ways so that they form one flesh. And to try to do it another way is a distortion. It's a corruption. It's a dysfunction of the way God made it.
2) As I reflect on and the way it unpacks the problem with homosexuality, it appears to me that it is saying something like this: When you exchange the glory of God for idols(things you treasure and prize more deeply than God), the main one that you exchange the glory of God for is yourself. The idol that you have is yourself. Well, what sex is yourself? My sex is male. If you're a woman reading this, your sex is female. And it seems to draw out the fact that in exchanging God for our most cherished idol, which is usually self, we are prone to fall in love with the same sex.
The deepest thing that I've ever hit upon for why God would disapprove of this is not just that the Bible says "Don't do it," and not just that God created male and female. Deep down there is a kind of idolatry (self-love) involved in same-sex relationships that is very profound.
The deepest problem of our lives, whether heterosexual or homosexual, is the terrible exchange of the glory of God for images. The exchange of the truth of God for a lie. The disapproval of having God in our knowledge. Failed worship is our worst disorder. This is beneath all the maladies of the world.
The reason Romans 1 focuses on homosexuality in these verses is because it is the most vivid dramatization in life of the profoundest connection between the disordering of heart-worship and the disordering of our sexual lives.
We learn in that, from the beginning, manhood and womanhood existed to represent or dramatize God's relation to his people and then Christ's relation to his bride, the church. In this drama, the man represents God or Christ and is to love his wife as Christ loved the church. The woman represents God's people or the church. And sexual union in the covenant of marriage represents pure, undefiled, intense heart-worship. That is, God means for the beauty of worship to be dramatized in the right ordering of our sexual lives.
But instead, we have exchanged the glory of God for images, especially of ourselves. The beauty of heart-worship has been destroyed. Therefore, in judgment, God decrees that this disordering of our relation to him be dramatized in the disordering of our sexual relations with each other. And since the right ordering of our relationship to God in heart-worship was dramatized by heterosexual union in the covenant of marriage, the disordering of our relationship to God is dramatized by the breakdown of that heterosexual union.
Homosexuality is the most vivid form of that breakdown. God and man in covenant worship are represented by male and female in covenant sexual union. Therefore, when man turns from God to images of himself, God hands us over to what we have chosen and dramatizes it by male and female turning to images of themselves for sexual union, namely their own sex. Homosexuality is the judgment of God dramatizing the exchange of the glory of God for images of ourselves.
I'm sorry for the long post. It's quite an important subject, I believe. This isn't really a debate topic, because everyone's just sharing their beliefs, no one's really debating. I don't mean to sound preachy, but I'm sharing what I believe.
I don't hate homosexuals and never will. I love them and want only to point them to Christ, who restores what we've distorted and corrupted.
So don't hear me isolating it as the worst of all sins. It is part of a brokenness that I share.
I know that I'm broken. I could give you specifics: they would have to do with anger, self-pity, lust. And I'm just wired to like certain sins a lot. I think it's partly genetic. I think it's partly family-based, and it's just me. I'm broken.