There are several straw-man arguments here. First, I know that some people equate "acceptance" with "approval." These two are not the same. We are called to accept people where and how they are, and by our love and inclusion show them a better way in Jesus. If God sees a need to change them (OR US), that's up to Him. (Mike-drop.)
As far as " look[ing] out for the beliefs of whatever faith is under attack." the best defense is living a Christian life of love, acceptance, and support and letting others see the beauty of your belief. As far as defending God...well, that is just un-Biblical; God defends us. Read Isa. 46.
As far as "private sins" are not ALL sins between the individual and God? And ALL sins affect people around us. How is "openly" LGBT+++ any different than "openly" controlling, lying, bullying or excluding. Yet the one is readily accepted and the other is condemned and excluded. ALL sin is sin.
One is born with a very dominant personality needing to control everything, the other is born preferring the same gender. Both are "wired" that way. Neither one chose that. Both are sinners* Yet we exclude the one and praise the other.
It is not our job to judge and condemn or exclude anyone. We are called to love and include EVERYONE. I know that sits VERY uncomfortably with the old-school mind. They're so afraid the church will be filled with homeless and hookers and drug addicts and pimps and thieves and God knows what. Actually, I can barely think of a better situation, because I AM INCLUDED! JoeMo, you said you had a jaded past. I relate. I have one too. I also have a jaded present. It bothers me, but I leave it with God. And God knows what. God knows what I have done. God knows what I will do. God knows what YOU have done, and will do. And God knows what He wants, and how to achieve it.
*Certain caveats apply, beyond the scope of this discussion.