Not only has the decline in non-Christians' regard for Christianity been severe, but Barna results also show a rapid increase in the number of people describing themselves as non-Christian. One reason may be that the study used a stricter definition of "Christian" that applied to only 73% of Americans. Still, Kinnaman claims that however defined, the number of non-Christians is growing with each succeeding generation: His study found that 23% of Americans over 61 were non-Christians; 27% among people ages 42-60; and 40% among 16-29 year olds. Younger Christians, he concludes, are therefore likely to live in an environment where two out of every five of their peers is not a Christian.
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