The US is increasingly portrayed as a hotbed of religious fervour. Yet in the homeland of ostentatiously religious politicians such as Michele Bachmann and Rick Perry, agnostics and atheists are actually part of one of the fastest-growing demographics in the US: the godless. Far from being in thrall to its religious leaders, the US is in fact becoming a more secular country, some experts say. “It has never been better to be a free-thinker or an agnostic in America,” says Annie Laurie Gaylor, co-president of the FFRF.

The exact number of faithless is unclear. One study by the Pew Research Centre puts them at about 12% of the population, but another by the Institute for the Study of Secularism in Society and Culture at Trinity College in Hartford puts that figure at around 20%.

Most experts agree that the number of secular Americans has probably doubled in the past three decades – growing especially fast among the young. It is thought to be the fastest-growing major “religious” demographic in the country.