In the late 19th century and throughout most of the 20th century, the demographics of religion has changed a great deal.
Some historically Christian countries, particularly those in Europe, have experienced a significant decline in Christian religion, shown by declining recruitment for priesthoods and monasteries, fast-diminishing attendance at churches, synagogues, etc. Explanations for this effect include disillusionment with ideology following the ravages of World War II, the materialistic philosophical influence of science, Marxism and Humanism, and a reaction against the exclusivist claims and religious wars waged by many religious groups. This decline is apparently in parallel with increased prosperity and social well-being. It appears increasingly common for people to engage in far-ranging explorations, with many finding spiritual satisfaction outside of organized churches. This is a demographic group whose numbers are growing and whose future impact cannot be predicted.
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