Left-handed people are more likely to be atheists, a study has found, as it says belief is passed on genetically.

The study suggests that religious people have fewer genetic mutations and are therefore less likely to be left handed or have conditions such as autism or schizophrenia.

British academic Edward Dutton, a professor at Oulu University, Finland, said that in pre-industrial times religiosity was passed on like other genetic attributes because it was associated with greater stability, mental health and better social behaviour.

But modern science means many people who would not previously have survived are making it to adulthood and reproducing - leading to a greater incidence of atheism.

Lack of belief in God is connected to genetic mutations which cause attributes such as left-handedness or autism, the paper argues.