Younger people are less religious than older ones in many countries, especially in the U.S. and Europe
In 46 countries around the world, adults under age 40 are less likely to say religion is very important in their lives than are older adults.
Concentrated in Europe, Orthodox Christians have declined as share of the global Christian population, from 20% in 1910 to 12% today. But the Ethiopian community is highly observant and growing.
As Protestants prepare to mark the 500th anniversary of the Reformation, two new surveys show the theological differences that split Western Christianity in the 1500s have diminished.
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