Because for those who under math and statistics, percentages, rate per 100,000, etc. are the only way to provide meaningful analysis of trends over time. Population numbers change, rates per 100,000 and percentages account for that. Catholic numbers may be growing but as their part of the population they are shrinking. That means other religions or atheists are also growing, faster than Catholics.That's simple to answer, it's so obvious. The leftwing pollsters such as PEW, the leftwing atheists media outlets giddily presenting the PEW poll. A poll which is a misleading lie, btw, because they are showing percentages, NOT hard numbers.
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In U.S., Decline of Christianity Continues at Rapid Pace
The religious landscape of the United States continues to change at a rapid clip, with both Protestantism and Catholicism experiencing losses of population share.www.pewresearch.org