If he has done experiments and research to see how belief of God affects the brain, then his approach could be scientific and he may even conclude that belief in God affects the brains of partitioners. Reading on Wikipedia he has also researched "non God" religions such as Buddhism - - and he has found out that stuff like meditation (and praying) affects the partitioner's brain.

And really, as somebody has noted it above: it's very plausible that belief changes our brains, given that most humans throughout our history have had belief. And research in belief is _very_ interesting and might put light on why most of the humans today believe in something.