The fact is, most LGBT people I know didn’t leave the church because their behavior wasn’t affirmed—“I want to sleep with people of the same sex, and if you don’t affirm this I’m gone.” It was because their humanity wasn’t affirmed.
I'm sorry, but this is again trusting the unrepentant rather than the redeemed. For many the denial of a legitimate expression of sinful desire is tantamount to the rejection of the one with the errant desire.