Belief must be something different from a mixture of opinions about God and the world, and of precepts for one life or for two. Piety cannot be an instinct craving for a mess of metaphysical and ethical crumbs.
The usual conception of God as one single being outside of the world and behind the world is not the beginning and the end of religion. It is only one manner of expressing God, seldom entirely pure and always inadequate.
The whole of religion is nothing but the sum of all relations of man to God, apprehended in all the possible ways in which any man can be immediately conscious in his life. In this sense there is but one religion, for it would be but a poverty-stricken and halting life, if all these relations did not exist wherever religion ought to be.