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Religion as a concept is outdated, and it's inevitable that eventually, it will be gone from most developed countries.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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Actually your analogy is incorrect. More and more people are acquiring religion of one form or another. Protestants are in seemingly in decline and atheism and agnostics are on the rise, but that is only in the western world. In the eastern world, religion is paramount in their entire way of life, and they are aggressively promoting their faith.