The data from Gallup tracked church membership across the past 80 years, starting with 73% in 1937 and peaking just after World War II with 76% membership.
The past 20 years have seen a sharp drop-off, falling from 70% to 47% in that time.
The survey asked “Do you happen to be a member of a church, synagogue or mosque?”
Other questions covered the factors or reasons around religious attitudes and practices, with most respondents pointing to a lack of affiliation as the prime factor in their response.
Another major distinction arose between age groups: Church membership was strongest among those born before 1946, with 66% claiming membership, compared to 58% of baby boomers, 50% of Gen X and 36% of millennials.
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