You can never be absolutely certain that anything doesn't exist. But you can show that it's unlikely.

Theologians will protest that the story of Abraham sacrificing Issac should not be taken as literal fact. And the appropriate response is twofold: first, many, many people even to this day, do take the whole of their Scripture to be literal fact, and they have a great deal of political power over the rest of us, especially in the United States and in the Islamic world. Second, if not of literal fact, how should we take the story? As an alagory? Then an alagory for what? Surely, nothing praiseworthy. As a moral lesson? But what kind of morals could one derive from this appalling story?

The alternative which I favor is to renounce all euphemisms and grasp the nettle of the word atheism itself, precisely because it is a taboo word carrying frissons of hysterical phobia. Critical mass may be harder to achieve than with some non-confrontational euphemism, but if we did achieve it with the dread word atheist, the political impact would be all the greater.

We're going to die, and that makes us the lucky ones.

Natural selection, the blind, unconscious, automatic process which Darwin discovered, and which we now know is the explanation forthe existence and apparently purposeful form of all life, has no purpose in mind. It has no mind and no mind's eye. It does not plan for the future. It has no vision, no foresight, no sight at all. If it can be said to play the role of the watchmaker in nature, it is the blind watchmaker.

The more statistically improbable a thing is, the less we can believe that it just happened by blind chance. Superficially, the obvious alternative to chance is an intelligent Designer.

The cynic about human nature might say that religious morality is an effective way of keeping people in line. The threat of hell, the reward of heaven, but the rules of the holy books are out of date and often barbaric.