Shame on me; I've been overlooking the possibilities in this matter. For quite some time, articles and books on "Why I joined this or that" have been in circulation. But studies of why someone did not join this or that are a good deal scarcer.
Perhaps there could be a book on "Why Pope Benedict XVI has never become a Mormon" or "Why Winston Churchill Dissented from the Views of the Plymouth Brethren". We could even combine the two genres, with something like "Why Oscar Wilde Became a Catholic on his Deathbed Instead of Becoming a Deathbed Quaker".
Dear Father Serge,
I agree...such a bizarre and strange title!!