Your dad was a great man-one that wasn't afraid to stand up for what he thought was right. From what you write he was as genuine as they come. I've heard "rank and file" used by witnesses but "company men?" I can't imagine anybody entrenched in this cult use that expression. Also the fact the he only wanted to listen to the Bible, would lend itself to someone who was able to see what was behind the curtain.
By the way WELCOME