From Eric Hoffer 1902-1983), American writer on social and political philosophy Reflections on the Human Condition (1972):
The Savior who wants to turn men into angels is as much a hater of human nature as the totalitarian despot who wants to turn them into puppets. There are similarities between absolute power and absolute faith: a demand for absolute obedience; a readiness to attempt the impossible; a bias for simple solutions — to cut the knot rather than unravel it; the viewing of compromise as surrender; the tendency to manipulate people and “experiment with blood.”
Both absolute power and absolute faith are instruments of dehumanization. Hence absolute faith corrupts as absolutely as absolute power.