TCP, you evidently are illiterate in RC theology.
When baptized, confirmed, or ordained you receive an indelible mark on your soul that can never be erased no matter whatsoever you do after the sacramental anointing. Marked for eternity.  
So, people like Hitler, Mussolini, Sarah Palin, Glen Beck, Mike Pence, etc. (a few of legions) are still RCs.
So, same with ordination. Pope John XII (poster boy of bad popes), Martin Luther (poster boy of dissident priests),
and in our own time, John Geoghan (poster boy of pedophile priests), etc. remains priests forever, according to the order of Melchizedek (as my bishop likes to note), because of RC theology.
But I'm not a bishop like Christopher Coyne. Interesting speculative point:  Do bishops remains bishops forever, or only priests?