That doesn't speak very well of gays.
We Christians openly admit that we are guilty of sin, we are all, every one of us, hypocrites. The difference is not what we are today, but the change we're trying to make. We are repentant. We don't want to sin, we don't want to be hypocrites. In becoming a Christin a gay couple would join us in rejecting sin, which means they would have to reject their marriage.
Accepting SSM in the church means accepting sin. This is no different than accepting fraud or a diet rich in purines.