Religious belief is determined by a person's genetic make-up rather than by any divine intervention, according to a study. After comparing more than 2000 DNA samples, the American geneticist who in the early 1990s claimed to have discovered the "gay gene" has concluded that a person's capacity to believe in God is linked to brain chemicals. His findings have been criticised by clerics, who challenge the existence of a "god gene" and say the research undermines a fundamental tenet of faith - that spiritual enlightenment is achieved through divine transformation rather than the brain's electrical impulses. Dr Dean Hamer, director...