To an increasing number of people the idea that a religion which means to be something more than an heroic moral idealism has any significant place in the modern world seems open to grave doubts. Moreover, a large body of traditional metaphysical doctrines and systems are being subjected to much the same sort of criticism which religion is called upon to face. Three general arguments are used to show that both traditional religion and traditional metaphysics are no longer able to do what clear thinking and enlightened practice demand.