"The Bible vigorously opposes mystics of all descriptions, including Christians, who ascend to heaven and contemplate God by means of ascetic practices. God can never be directly grasped or contemplated face to face ... The only channel of revelation is the Word."
Ellul's kind of Christianity is what we get when we start limiting God to a radical OT ideal, mixing in some modern gnosticism, and throwing in a pinch of Cartesian dualism.
Of course, it helps when you decide that the Bible itself is really God.