Each generation less and less people are becoming religious (in America at least). People are recognizing science and calculable, observable facts, rather than words from thousands of years ago on absurd stuff.
Religion as a concept is outdated, and it's inevitable that eventually, it will be gone from most developed countries. The question is, when do you think it'll happen?
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Spirituality will definitely remain for a very long time, but hopefully organized religion goes away soon.