The short answer is religion is on the wane in western Europe and North America, and it’s growing everywhere else. The median age of the global population is 28. Two religions have a median age below that: Muslims (23) and Hindus (26). Other main religions have an older median age: Christians, 30; Buddhists, 34 and Jews, 36. The religiously unaffiliated come in at 34.
Islam is the fastest-growing religion in the world – more than twice as fast as the overall global population. Between 2015 and 2060, the world’s inhabitants are expected to increase by 32%, but the Muslim population is forecast to grow by 70%. And even though Christians will also outgrow the general population over that period, with an increase of 34% forecast mainly thanks to population growth in sub-Saharan Africa, Christianity is likely to lose its top spot in the world religion league table to Islam by the middle of this century.
Hindus are set to grow by 27%, and Jews by 15% mainly because of the high birth rate among the ultra-Orthodox. The religiously unaffiliated will see a 3% increase. But proportionately, these religious groupings will be smaller than now because their growth is lower than the increase in the overall global population. And Buddhists are forecast to see a 7% drop in their numbers.
It’s mainly down to births and deaths, rather than religious conversion. Muslim women have an average of 2.9 children, significantly above the average of all non-Muslims at 2.2. And while Christian women have an overall birth rate of 2.6, it’s lower in Europe where Christian deaths outnumbered births by nearly 6 million between 2010 and 2015. In recent years, Christians have had a disproportionately large share of the world’s deaths (37%).
And while the religiously unaffiliated currently make up 16% of the global population, only about 10% of the world’s newborns were born to religiously unaffiliated mothers between 2010 and 2015. But 23% of American Muslims say they are converts to the faith, and in recent years there has been growing anecdotal evidence of Muslim refugees converting to Christianity in Europe.
China has seen a huge religious revival in recent years and some predict it will have the world’s largest Christian population by 2030. The number of Chinese Protestants has grown by an average of 10 % annually since 1979, to between 93 million and 115 million, according to one estimate. There are reckoned to be another 10-12 million Catholics.
In contrast, Christianity is in decline in Western Europe. In Ireland, traditionally a staunchly Catholic country, the proportion of people identifying with Catholicism fell from 84.2% to 78.3% between the two censuses of 2011 and 2016, and down to 54% among people aged between 16 and 29. Those with no religious affiliation increased to 9.8% – a jump of 71.8% in five years.
In Scotland, another country steeped in religious tradition, a majority of people, 59%, now identify as non-religious – with significantly more women (66%) than men (55%) turning away from organised faith. Seven in 10 people under the age of 44 said they were non-religious; the only age group in which the majority are religiously affiliated is the over-65s.
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