As I have mentioned before in my article The Problem with Science, the underlying fault with this belief is this. If there is, in fact, a supernatural force, it is not even taken into account as a possibility as the cause of any events. However, there is somethng that we do everyday that I believe requires the presence of a supernatural, which I believe to be the God of the Bible.
The very fact that we are able to debate it proves a supernatural force exists. This argument is so simple, I'm surprised it is not brought up more often. Follow my logic.
According to naturalistic belief, all processes of living things are essentially chemical in nature. Unless you believe in some magical force called “life” which would be supernatural in itself. Actually I think some biologists do believe in the mystical “life.” They just don't admit it. “Life finds a way.” says Ian Malcolm in Jurassic Park.
Anyway, if all biological processes are chemical in nature, then they all simply follow the laws of chemistry and occur according to the nature of chemical reactions. For example, in 10th grade biology we were all taught the various chemical reactions that make up the processes of photosynthesis or DNA replication. Now understand that in a purely naturalistic universe, all chemical processes are the result of the law of cause and effect. In other words, if this molecule comes within a certain distance of that molecule they will always react in a certain way. In a purely naturalistic universe there is no randomness. All molecules are where they are because some other effect caused them to be there.
Now if this is true, then the same types of processes occur in the brain. After all, thoughts, according to naturalistic science, are simply caused by chemical reactions. As stated before, these reactions are caused by certain molecules being in certain places at certain times. But these places and times are determined by previous reactions. This series goes all the way back to our conception, which itself was caused by molecules being in certain places at certain times.
Therefore, in a purely naturalistic universe, there is no such thing as a random thought. All thoughts you have ever had were the result of chemical reactions which were caused by previous chemical reactions, etc. You have no free will even regarding your thinking, unless you believe that something called “the mind,” which Christians would call the soul, directs these molecules to be in certain places at certain times causing certain thoughts. But that would be supernatural. Otherwise, even the actions of the mind would be the result of cause and effect.
So, if you believe in a purely natural universe, you are saying that we can actually know nothing to be real because all thoughts were pre-determined at the time of the Big Bang (if there was one) and all aspects of the universe (even thoughts) are simply the results of series of chemical reactions. If you have an independent thought that you caused, then you must have a supernatural mind that can direct the chemicals that cause your thoughts.