I suspect they ARE believers...
Some people just put more empasis on other's sin while ignoring and justifying their own...
I get a kick out of a fat preacher who will publically criticize somone else for smoking...
God does put special enphasis on the sin of homosexuality...
Ultimately, God will say to some, "well done, good and faithful servant"...I suspect to others, he will lower his eyes and say, "Oh, it's you...Have a seat, over there around the corner"...
I agree with you to some extent. Although I believe that the difference here is that these people are endorsing and condoning the act of homosexuality (obviously a sin in the Bible). I see that as different from sinning yet not trying to get others to sin with you (what we all do).