BEING gay can never be a sin – all humans suffer temptation, and being straight is just as great a temptation. So that’s not it. Even if gay sex is directly sinful, a celibate gay is innocent of ‘gay behavior.’
There is also “hate the sin, love the sinner” – that applies to wife beaters, marital cheaters, gossips, liars, – – and in fact we all sin constantly. Paul himself said, “My most righteous acts are like used menstrual pads”— the most ghastly comparison a male could make in his day.
I regard the entire gay-straight thing as the devil’s work because Jesus never said a thing about it nor do the Ten Commandments mention it. Instead we have the cultural sin of inhospitality in Sodom – it wasn’t sex per se, it was humiliating a visiting stranger, which in those times was about as ‘wrong’ as you could get in those days.