Would someone please send Brian McLaren a Bible. That poor man thinks God is a big unknowable mystery. But, the Bible is God's revelation about Himself and it reveals sooooo much good and knowable stuff about God. Sure no one can comprehend all that God is BUT the truth remains that we CAN comprehend what He's revealed about Himself in His Word.
Rather than singing about knowing nothing about God maybe McLaren can sing about the great truths revealed in scripture.
We think he should write a song about the Penal Substitution. The first line can begin "He Was Pierced for Our Transgressions".