If you're not sure, wouldn't it be better to abstain even if it MAY be sin?
Yes, if you have any doubts, then for you it is sin. Until you are sure, you should assume it is sinful and avoid the activity. (Which is why I quoted 1 Corinthians 8 and referenced Romans 14 and Colossians 2)
But the way to clear up your doubts is to study and pray and be guided by the Holy Spirit. And my study and prayer and reliance on the Holy Spirit have shown me that there are only four passages which are relevant to the question of whether
all forms of same-sex activity are sinful. Leviticus 18:22; Leviticus 20:13; 1 Corinthians 6:9-10; and 1 Timothy 1:8-11. That they only forbade one form of homoerotic expression, by one of the partners, and only for the Jews, as an expression of ritual separateness.
All of the other passages are talking about other things entirely. You can only try to claim Genesis 19 is not about evil political terrorism including gang-rape if you ignore the parallels to Judges 19 and 1 Chronicles 19.
You can only focus on the fact that the example of sexual addiction in Romans 1:26-27 is same-sex if you ignore the fact that Paul was quoting from two different older documents, one Jewish (
Wisdom of Solomon) and one Greek (Plato's
Laws), and was trying separately to lull the Jewish readers and the Greek readers into the same "trap" in chapter 2. For the Jews, he was trying to invoke the Leviticus ban, without spelling it out, but for the Greeks, the example came straight out of
Laws, where Plato (or rather the character of "the Atheninan") makes it clear that the homoeroticism in the example is mostly meant as a tweak to one of the other characters in the dialogue, a Cretan (On Crete in the time of Plato, they were more "relaxed" about when an eromenos' training was over than in Athens or Sparta, using Ganymede (aka Catamitos) as an example.)
All other passages used to condemn homosexuality condemn either temple prostitution in general as idolatry, or condemn sexual immorality in general and both depend on already assuming that homosexuality is sin.
On the other hand, gays are mentioned twice in the New Testament, and while they are not praised, neither are they condemned for being gay.