He may well have been. I have no idea.
I've got no love for the 'church', but I won't try to pin Charles Manson on them. Lots of well known people have been passing members of that organization, including John Brodie, Stanley Clarke, Ingo Swan, Christopher Reeve, Chaka Khan, and many others.
John Brodie - I remember reading that Sports Illustrated. I always like him as a QB, even though in those days usually the 49’ers sucked.