Why Must there be a God

If the general picture of a big bang followed by an expanding universe is correct, then what happened before that. Was the universe devoid of all matter? And then the matter somehow somewhere happened, how did that happen? In most cultures the common answer is that a God or Gods created the universe out of nothing. But if we wish to pursue this question courageously we must be willing to ask the next question, Where did God come from?

If we decide that this is an unanswerable question, why don't we save a step and conclude that the origin of the universe is an unanswereable question. Or if we conclude that God always existed why don't we save a step and conclude that the Universe always existed? There's no need for a creation it was always here.

Carl Sagan
The Cosmos

He who has not the strength to question his own surroundings does not deserve thy own life.