This is used by Way of the Master, and Hovind, and Probably others. It's very flawed.
" Do you know everything? " the Christian asks the Atheist,
" No, of course not." Responds the Atheist,
" Do you know half of everything? " asks the Christian,"
" Wow, no, probably much less than that..." admits the Atheist,
" In the half you don't know, could God exist??? " the Christian rests.
This formula is NOT a good proof of God's existence. It COULD be used to conjure up ANYTHING.