Don't mean to hijack this thread, but I can't help it.
Your entire comment up above is the reason why OSAS is such a bad doctrine.
The N.T. tells us to ENDURE, to HOLD FAST, to CONTINUE IN, and so forth.
If he was Christian before and then goes back into the world, what does this tell us?
I don't know the Whole story of Jenner. Was he born again before, after?
IF he was born again before, he definitely disobeyed the word of God. What he did is such a bad testimony for Christianity - which is what I believe the O.P. referring to. In short, he did go back into the world.
Different scripture comes to mind, for instance,
1 Corinthians 5:9-12 where Paul tells the Church in Corinth not even to associate with immoral BRETHREN. One of the reasons is due to idolatry. Could being SO CONCERNED with how you look be called idolatry? I think so. Paul says we are to judge those that are in the church and advise them and help them.
And a funny scripture that comes to mind is
1 Corinthians 16:13...
"be on the alert, stand firm in the faith, act like men, be strong..."