Illustration: Brian Stauffer for the Wall Street Journal

By Daniel C. Dennett

Religion has been waning in influence for several centuries, especially in Europe and North America. There have been a few brief and local revivals, but in recent years the pace of decline has accelerated.

Today one of the largest categories of religious affiliation in the world—with more than a billion people—is no religion at all, the “Nones.” One out of six Americans is already a None; by 2050, the figure will be one out of four, according to a new Pew Research Center study. Churches are being closed by the hundreds, deconsecrated and rehabilitated as housing, offices, restaurants and the like, or just abandoned.

If this trend continues, religion largely will evaporate, at least in the West. Pockets of intense religious activity may continue, made up of people who will be more sharply differentiated from most of society in attitudes and customs, a likely source of growing tension and conflict.

Could anything turn this decline around? Yes, unfortunately. A global plague, a world war fought over water or oil, the collapse of the Internet (and thereby almost all electronic communication) or some as-yet unimagined catastrophe could throw the remaining population into misery and fear, the soil in which religion flourishes best.

Behind the decline

With hardly any significant exceptions, religion recedes whenever human security and well-being rises, a fact that has recently been shown in numerous studies, but was suspected by John Calvin in the 16th century. He noted that the more prosperous and comfortable his Genevans became, the less dependent they were on church. Presumably, those who deplore the decline of religion in the world today would not welcome the sort of devastation and despair that could give religion its second wind.

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