“Wrong ideas about God are not only the fountain from which the polluted waters of idolatry flow; they are themselves idolatrous. The idolater simply imagines things about God and acts as if they were true.
Perverted notions about God soon rot the religion in which they appear. The long career of Israel demonstrates this clearly enough, and the history of the Church confirms it. So necessary to the Church is a lofty concept of God that when that concept in any measure declines, the Church with her worship and her moral standards decline along with it. The first step down for any church is taken when it surrenders its high opinion of God.
Before the Church goes into eclipse anywhere there must first be a corrupting of her simple basic theology. She simply gets a wrong answer to the question, ‘What is God like?’ and goes on from there. Though she may continue to cling to a sound nominal creed, her practical working creed has become false. The masses of her adherents come to believe that God is different from what He actually is, and that is heresy of the most insidious and deadly kind.”
– A.W. Tozer, The Knowledge of the Holy (HarperCollins: San Francisco), 1961, p. 4.