Children, by and large, will always believe that something exists for a reason. When asked why there is an ocean a child will explain it's necessity for fish - and not that the Earth was pounded by asteroids for billions of years. Believers simply have never been able to outgrow the naivety of childhood. They are alternatively in a perpetual state of ignorant wonder or a maniacal, lethal force determined to shield themselves from adult thinking at any cost.

Let's not forget that the early Universe was not complex at all. There were no atoms and no contemporary laws of physics. Believers would have an argument if the very early universe was chock full of galaxies and planets with fruited planes. But it was far less complex than a fart.