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Hamer's findings led to his book The God Gene, and a series of headline stories repeated all over the world. A closer look at the data, however, found that the God gene wasn't all the initial news reports made it out to be.

Hamer himself later admitted that the God gene, while possessing a valid, statistically significant effect, could only account for 1% of the variation in self-transcendence scores reported in personality tests. In other words, Hamer had discovered "a God gene" rather than "the God gene," there presumably are many other genes that also explain differences in inclination to believe in the supernatural.
But is that the only possibility?
Smells and Bells, Rants and Chants
The VMAT2 protein is only significant when there are neurotransmitters for it to transport. Without the dopamine, serotonin, norepinephrine, and histamine it carries, the presence of absence of the VMAT2 protein is of little significance. This led critical thinkers to arrive at another explanation of how the so-called God gene works.
Especially in ancient times, religious activities were especially festive. The worship of gods and goddesses was typically accompanied by eating, drinking, and dancing, and quite often drugs and sex. The festival activities surrounding the worship of gods and goddesses leads to the production of the neurotransmitters dopamine, serotonin, and norepinephrine. People who had more copies of the God gene would get a bigger boost of these neurotransmitters in their brains and a stronger "high" from the religious festival.
In this context, the gene that codes VMAT2 is not so much a God gene as a party gene, the party coincidentally centered around the worship of the gods--or in the modern era, God. In our modern era, one way of looking at this is in terms of smells and bells, rants and chants. The more active the ceremony, the more it appeals to people who have the genes for making VMAT2.
Does the God Gene Prove or Disprove the Existence of God?
The reason that so many people get high on religion may have to do with its role in society. Especially in the pagan period when religious festivals involved sex, being more "into" the religion of the era may have increased the probability of passing on the "God gene" to one's offspring.
In Christianity, it's well-known that some of the persons who are sworn to celibacy (or monogamy) tend to fail their vows in rather spectacular fashion. It may simply be that the genetic inclination to intense worship may also carry an inclination to intense satisfaction from sex, food, dancing, alcohol, and drugs. In fact, religious rules against "sins" may make these activities even more tempting, since novelty, doing something different, also generates more of the chemicals that cause a brain-based high. The less a religion talks about sex, drugs, and rock and roll, the more they may appeal to its members.
None of this, of course, has any bearing on the question of whether there is actually a God. That is still a matter of faith. However, better understanding of our genetics may lead to better understanding of why some people are particularly fervent followers of God, and why they so often fail.
- Benjamin J., Li L., Patterson C., Greenberg B. D., Murphy D. L., Hamer D. H. Population and familial association between the D4 dopamine receptor gene and measures of novelty seeking. Nat. Genet. 1996.12:81-84.
- Hamer D. The God Gene: How Faith is Hardwired into Our Genes. New York: Doubleday
- 2004.
- Photo courtesy of David Dennis by Flickr : www.flickr.com/photos/davidden/1763021592/
- Photo courtesy of Dave 77459 by Flickr : www.flickr.com/photos/dave77459/1880010238/
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