I didn't say they did.
I don't believe Christ is a revolving door we can leave and come back through whenever we want.I don't think one person posting here believes that. Most agree with you and the saint being free from sin with the exception of the part of falling away.
Scripture says that because the seed of God is in a man he can't commit sin. (1 John 3:9)
You don't believe that.
People you deem to "have fallen away" never had the seed of God in them.From my observation the posters believe that a saint can FALL away and sin which makes the one that falls away a child of the devil and not longer in Christ and no longer a saint of God. Those that are God's are not in sin, no way, no how. If one believes that a saint is IN sin, they should challenge themselves on the many scriptures that oppose such doctrine.
From Scripture it is obvious that saints can fall away as many did. I think that is the concept that most on here adhere to and where your belief disagrees with them. If there is one that doesn't agree with that concept maybe they should step forward and state their belief.
If they had, it would have prevented them from committing sin.