G.K. Chesterton (from Orthodoxy) on denying sin:
“[The ancient masters of religion] began with the fact of sin – a fact as practical as potatoes. Whether or no a man could be washed in miraculous waters, there was no doubt at any rate that he wanted washing. But certain religious leaders in London, not mere materialists, have begun in our day not to deny the highly disputable water, but to deny the indisputable dirt. …
“The strongest saints and the strongest skeptics alike took positive evil as the starting-point of their argument. If it be true (as it certainly is) that a man can feel exquisite happiness in skinning a cat, then the religious philosopher can only draw one of two deductions.
“He must either deny the existence of God, as all atheists do; or he must deny the present union between God and man, as all Christians do.
“The new theologians seem to think it a highly rationalistic solution to deny the cat.”