The argument for a Big Banger is commonly called the Cosmological Argument and goes like this:
- Everything that had a beginning had a cause
- The universe had a beginning
- Therefore the universe had a cause
The objection that follows this is "Who created God?". The premise is that everything that began to exist had a cause not that everything has a cause. God is eternal and doesn't need a cause because he's always existed. But then the person might say "Well if God doesn't need a cause neither does the universe." While it might be logically possible that the universe is eternal, based on the science it doesn't seem that it's actually possible. To say the universe is eternal is to deny Einstein's theory of relativity, the second law of thermodynamics, an expanding universe, cosmic background radiation, and many other pieces of evidence.
That leads into the second premise that the universe had a beginning. It's unanimously accepted that the universe had a beginning. The universe is expanding from a single point in the far distance past. The Big Bang happened and the universe came into existence. In the moment right before the Big Bang nothing in the universe existed, no time, no nature. Things don't create themselves and nature is no exception. Things also don't come from nothing. The universe had a cause and that's referred to as the First Cause.
What sort of characteristics would the First Cause have?
- It would have to be outside time (timeless), space (non spacial) , and matter (immaterial) because it caused time, space, and matter.
- It would have to be unimaginably powerful to create the universe.
- It would have to be extremely intelligent to create all the laws of physics, the universe, and the conditions for complex life.
- It would have to be personal to make a choice to create. Impersonal forces (i.e. nature) can't make choices.
Resources
William Lane Craig has developed the Cosmological Argument in depth and does a great job of defending it. He's debated several times on the subject and always does more than hold his own. Below are some resources that develop and explain the argument well.
Books
Website: Stand To Reason