Doubt is an unavoidable part of belief. In the words of Paul Tillich, “Doubt isn’t the opposite of faith; it is an element of faith.”1 If the case in favor of belief in God were utterly airtight, then the world would be full of confident practitioners of a single faith. But imagine such a world, where the opportunity to make a free choice about belief was taken away by the certainty of the evidence. How interesting would that be?
