A year or so ago, a brain study found that people who believe in God or have religious experiences have a different brain structure than those who don't. You can read a summary of the research here.
I find this kind of fascinating... especially given that my dad and I are on completely different ends of the spectrum as it relates to God. My father is an atheist and I am a washed by the blood of the lamb born again Christian.
But does the fact that there seems to be a physical difference between believers and non-believers actually have any bearing in whether God is real... or whether he calls us all, equally, to be in relationship with him?
I imagine the non-believing folks with non-believing brains would like to say that some anomaly in my brain is the source of my fantasy that God exists. I, of course, think it is just the opposite. For me, a person with the non-believing mind is a little like someone who is color blind. Their physiology prevents them from seeing the color red. But their inability to see it doesn't mean that red doesn't exist.
A person born blind can't see the world at all... but it doesn't mean that the beauty of the world is the figment of the imagination of those of us who are sighted.
The article about the brain physiology went on to say that the God believer brains had more real estate in the compassion and social centers. I wonder if people are born with that extra brain power, or if the belief in God somehow rewires us to be more compassionate.
The study didn't address cause and effect. It didn't research the brains of converts, before and after. To me, that would be fascinating... to see if our physiology actually changes when we become believers.