As a lapsed Presbyterian, I can unequivocally say that the church drove me out with their anti-gay stances. I'll never forget my mother calling me one Sunday after she'd gone to church when I was a teenager. I was 16 and living on my own - a necessity after I'd come out in high school to disapproving parents.
Mom called in tears to beg me to "go straight again." The women at the church had sat down with her after the service to tell her how concerned they were for my eternal soul and how "other members" (read: them) might judge her parental skills since she'd obviously done something wrong since I'm gay. That was the end of my Presbyterian ways; I've attended church services at a Presbyterian church twice since then.
Years later, mom called to tell me exciting news about the church. They had a new minister - a female. "And she's gay friendly!" Mom said. Within the next year, the minister had confessed to Mom that she was actually a lesbian, but since the church forbid gays and lesbians from becoming clergy, it was a closely guarded secret. (Mom had done a major turnaround about sexuality in the years since I came out.)
So it was with some sense of joy that I see the Presbyterian Church (USA) has voted to allow openly gay clergy members. Of course, as with all things Presbyterian, that joy was tempered somewhat when the General Assembly voted to sidestep same-sex marriage validation in favor of "a special study" on civil unions and marriage.
It's been 20 years since I left the church; maybe in another 20 years they'll consider me part of the body of Christ again. Until then, I'll keep worshiping the God I know - the one who loves everyone equally.