You are dead wrong. The significant part of the teaching is THE ENTIRE THING! One part or another of what Jesus is recorded as saying is mot more or less important than any other part. That is cafeteria christianity and God does not work that way. You do not get freedom of “then neither do I condemn you” WITHOUT the “then rise child, go, and sin no more”...
Grace is not a license to do whatever without condemnation. We are called to a higher striving than a basic fire insurance policy. “Therefore be perfect, as your Father in heaven is also perfect.”
Now, I agree with your last paragraph — the LAST thing I would do in this case is bash the guy on the head with a Bible while screaming passages from Leviticus at him. But I would want to have a conversation with the man about the condition of his faith, gently and respectfully, out of love and concern for where the road he is on will take his soul in too short a time...
I already acknowledged that. It was part of the point that I was making regarding condemnation.
My belief system simply does not completely match yours. So, it would probably be wise to simply agree to disagree, and leave it at that.