-- "spiritual but not religious." "Followers of Christ but not Christians." "Jumbo shrimp." (Just kidding about about the term "jumbo shrimp;" it doesn't belong in this discussion because if the shrimp in question are unusually large, the term actually makes some sense.) And Now: The Amazing Story Of Frank Schaeffer, The Atheist Who Believed In God!
If it were not already quite enough that Schaeffer claims to be simultaneously a believer and an atheist -- oh, but it is, it is -- in this book Schaeffer claims never to have met an atheist nor a believer. Nonsense is one thing. Inconsistent nonsense is quite another, and writing "or" when "nor" is correct -- strike three, siddown, Schaeffer!
Just as there was a serviceable existing description of SBNR's etc -- they're Protestants -- so also is there a term for what Schaeffer is talking about in the title of his goofy new book: he's a Christian who has crises of faith now and then. If he had them a lot he might actually wake up someday and become a nice sensible atheist, but we really shouldn't hold our breath in Frank's case.