His aversion to religion, in the sense usually attached to the term, was of the same kind that of Lucretius: he regarded it with the feelings due not a mere mental delusion, but to a great moral evil. He looked upon it as the greatest enemy of morality: first, by setting up factitious excellencies - belief in creeds, devotional feelings, and ceremonies, not connected with the good of human kind - and causing these to be accepted as substitute for genuine virtue: but above all, by radically vitiating the standard of morals; making it consist in doing the will of a being, on whom it lavishes indeed all the phrases of adulation, but whom in sober truth it depicts as eminently hateful.
John Stuart Mill
1806 - 1873