Since I “came out” as an atheist, I’ve been getting lots of questions about why I changed and how I can justify it. This article series is intended to provide a starting point for discussing those questions.
Part One of this series dealt with my story of de-conversion. In Part Two, I outlined the reasons why I reject belief in the Christian god. In this part, I’ll go a step further and explain why I reject belief in all deities.
This list of arguments is not meant to be comprehensive. A comprehensive list would require enough material to fill up several books. These are just brief introductions to the arguments that I personally find most convincing
1. God has no explanatory power.
Thousands of years ago, humans knew very little about the world around them. They saw many phenomena that they couldn’t explain. Lightning, rain, wind, earthquakes, seasonal change, the sun, the nighttime sky, mental illness. None of these were understood by ancient humans. The best explanation that these people could come up with was that there were supernatural forces, gods, or a God at work. If I had lived then, I would probably have believed the same.
But then, our curious nature led us to investigate these phenomena and we began understanding them in naturalistic terms. Science has pulled back the veil to get at the mechanisms of the world. We now know why lightning happens. It isn’t an angry god trying to frighten us; it’s a discharge of electricity in the atmosphere. We now know that the sun isn’t just a bright light in the sky; it’s a star, powered by thermonuclear fusion. And so on.
Of course, science hasn’t explained everything yet. That’s why we still have scientists, working to bring us to an ever increasing understanding of the universe. Some theists still want to use God as an explanation for those phenomena which have no scientific explanation. But using God as an explanation is really no explanation at all. It doesn’t actually tell us anything about the mechanisms behind what we observe.
As time passes, there will be fewer and fewer places where the theist can feel justified in using God as an explanation. For those areas where we don’t currently have a good scientific model, it’s far better to say that we just don’t know enough to understand them than to invoke God. An explanation that pulls us away from the underlying natural truth is worse than no explanation at all.
2. Prayer doesn’t work.
A typical theistic claim is that God can be influenced by prayer to manipulate the world in supernatural ways. However, to my knowledge, there has never been a single case of the power of prayer being confirmed under reasonable experimental conditions.
In 2006, a massive study was performed by Harvard University to determine the effects of prayer on the recovery of 1802 cardiac bypass patients. [1] The patients were divided into several groups, some of whom received prayer and some who didn’t. Those who were prayed for received daily prayer from multiple Christian congregations across the U.S. in the 14 days leading up to their bypass surgeries. The study concluded that there was no measurable benefit to the groups that received prayer. In fact, the group that was prayed for and knew that they were being prayed for fared worse than average. This has been attributed to a possible form of performance anxiety.
If there’s no objective evidence that prayer works, why, then, do so many people claim to have witnessed the power of prayer? The likely answer is that we humans suffer from a number of cognitive biases that distort the way we perceive reality. Confirmation bias, for example, is a type of selective thinking where a person tends to highly weight positive outcomes and discard negative outcomes. [2] When applied to prayer, confirmation bias tends to make people remember the exciting times when prayer seemed to be miraculously working, but forget the many more times when prayer had no effect. In reality, the number of positive outcomes experienced is only what one would expect to see given the normal operation of probability.
3. The soul doesn’t exist.
All of the most prominent religions claim that there’s a supernatural component to the human person – the soul. The soul is supposed to be the part of us where our mind “lives”. It continues to exist and have consciousness after our bodies die. It’s this part that enters the afterlife. However, if there is actually no soul, then what reason is there to believe in an afterlife?
There has been a huge amount of study into the nature of consciousness by neuroscientists. As time passes, and we learn more about the underlying mechanisms of personality, there are fewer and fewer places for the soul to hide. We already know through brain imaging that all emotions have direct physical causes in the brain. We can even stimulate these emotions electrically or pharmacologically. [3]
Experiments with victims of brain damage have shined an illuminating light on the way the brain works. There are hundreds of cases where brain damage sufferers have had noticeable changes in personality following their trauma. Neuroscientists can even predict what kind of personality change will happen based on which area of the brain has been affected. [4] If that’s the case, what purpose does the soul serve in making up our personalities? The answer, according to neuroscientist Steven Pinker and the majority of his peers, is that the mind is a direct product of physical processes in the brain. [5] There’s no need to posit a soul to explain anything we observe about human behavior.
4. The JREF Million Dollar Challenge.
Since 1964, the James Randi Educational Foundation (JREF) has offered a monetary prize to anybody who can demonstrate supernatural or paranormal powers under reasonable experimental conditions. [6] The prize currently stands at one million dollars USD.
The rules are simple. Propose a testable supernatural power, and work with the foundation to come up with a reasonable test. Go through the test, and if there’s no current scientific explanation for the results, you win a million dollars. Over 1000 people have applied to pass the challenge, but so far nobody has succeeded. [7]
If the supernatural really did exist, why hasn’t anybody been able to demonstrate it? Miracles are widely reported by theists, yet none of these supposed miracles has ever been substantiated. If they really did happen, proving them would be easy. Have a doctor sign a notarized statement confirming that your sick friend has some incurable medical condition. Pray for it to be cured, then have the doctor confirm that the miracle happened. You (or a charity of your choice) just became a million dollars richer.
5. Subjective experiences are untrustworthy.
A typical defense of theists is to claim that they have experienced God in some way. They claim to have witnessed divine healing, seen angels, or felt God’s presence. I once thought I had experienced all of these things and more. No matter what rational argument is brought before him, a theist may fall back on his subjective experiences as “proof” of God’s existence.
But how reliable are such experiences? Optical illusions demonstrate that our senses can be fooled. [8] Drugs, some of which can be produced by our own bodies, can alter our perception. [9] Hypnosis has been widely documented as a way to enter an altered state of consciousness. [10] Errors in judgment due to subconscious cognitive bias are also a well-documented. [11]
The main problem with using personal experiences as a defense for religious faith is that they aren’t testable. Unless I can directly measure your experience, and observe it for myself, there’s no reason for me to believe it.
Conclusion
Do gods or a God exist? Nobody can say for certain. Anybody who claims to know has thus far been unable to provide objective proof. However, the weight of the evidence (or lack thereof) is strongly on the side that the supernatural does not exist. All it would take is one single piece of verifiable evidence to make belief in God a viable option. Since no such evidence exists, the most rational position to take is that of atheism.
I’ve received quite a number of good questions in response to this series, so I plan on writing a fourth installment in which I’ll answer them. Stay tuned.
Notes
- Am Heart J. 2006 Apr;151(4):934-42.
- http://www.skepdic.com/confirmbias.html
- http://mindblog.dericbownds.net/2009/03/neuroscience-and-soul.html
- http://www.abarnett.demon.co.uk/atheism/brain.html
- http://www.edge.org/documents/archive/edge53.html
- http://www.randi.org/site/index.php/1m-challenge.html
- http://www.randi.org/site/index.php/component/content/article/37-static/254-jref-challenge-faq.html
- http://en.wikipedia.org/wiki/Optical_illusions
- http://www.opioids.com/opiates.html
- http://en.wikipedia.org/wiki/Hypnosis
- http://en.wikipedia.org/wiki/Cognitive_bias
http://www.opioids.com/opiates.html


