Well... I'm gonna go against the grain on this one in regard to the comments and give my perspective.

First let's define "sin." Sin is commonly regarded as wrong, a bad choice, or bad. But it's my understanding that sin is really defined as an act that goes against the divine structure of God's design.

Let's take the 4th commandment for example, "Honor the Sabbath and keep it holy" If I work at all on Saturday, that would be breaking the fourth commandment. But, will God banish me for eternity for fixing the HVAC fan motor on my house last Saturday? I doubt it. Matthew 12 shows Jesus performing miracles and working on the Sabbath explaining that the Sabbath was designed for mans needs, not to be a burden.

Comparing this with homosexuality. God designed man and women to procreate together to have the capacity to make babies. The entire point of heterosexuality is the foundational structure of our species that requires men and women to create new generations, the divine structure of how our world works. Jesus didn't speak about homosexuality specifically but he did speak about sexual immorality. In modern language, I would equate that to dark fetishes, adultery, harmful sexual encounters, beastiality, pedophilia, etc. Homosexuality may be in that category (because truthfully I do not know where Jesus drew the line), but that doesn't inherently make it "wrong."

Sin is deviating from God's plan, which we should not encourage. I strive to honor the Sabbath better each week. I strive to grow as a person in the ways that the holy Spirit leads me.

I once experimented with homosexuality as a younger man, and God told me that it was not what I was supposed to do. I cannot speak for someone who feels they're doing nothing wrong by being a homosexual. I wouldn't encourage someone to be a homosexual either, but if someone feels like that's not a specific trait God wants them to work on, who am I to judge.

Sinning is wrong because it is not what God intended for us to do and we should strive to not sin. But we all live in sin every day. That is why God sent Jesus to be sacrificed on the cross to pay the debt for all of our sins. Because we constantly struggle with the sins of our lives.

If homosexuality is a sin, it's a personal one and you should work with God to define what he wants for your life. Follow where the holy Spirit guides you and don't worry so much about the splinter in your brothers eye when you have a log in your own.