Actually, did not my questions come first?
But, to answer, biblically, adultery is always wrong. And, it is deserving of death. It is not ok now, if that is what you think changed. What God chooses to do about may have - and there are still consequences to adultery, even if no one else knows but the two involved.
Your turn.
I want to know whether the original penalty was right or not. So in your god's eyes it is always moral to stone adulterers?
Jesus said, "Let he who is without sin cast the first stone.".
Obviously he is demonstrating he doesn't know his ass from his elbow.... no one would cast a stone because the mob was equally guilty of "sin" (generic).