Would it benefit churches and evangelists to learn why Christians of their own persuasion deconvert?
They already know: Satan has deceived them! Through his evil tools of evolution and the modern world's debaucherous attitude, their souls have become tarnished and must be saved from secularism which attempts to deny GOD!*
Should churches and evangelists try to learn what they're doing wrong from deconverts and try to correct their methods accordingly?
But they bring the Word Of GOD™! They could not be doing anything wrong!*
How would churches make up for the current lack of departure interviews
Ah, that's another easy one. All atheists are exactly the same because atheism is a religion with tenets of faith, so all you have to do is ask one atheist; not even that, just watch one on TV or read one of their
books holy texts! Then you know exactly what all of them are thinking!*
*Yes, this is
all sarcasm. Who would honestly be so stupid as to think these things (apart from creationists)?