I'm not sure about the timing...10 years, 15 years, whatever. I have come to believe that faith is not necessary. Everyone has crises of faith, even the best of us. The important thing is to live one's life according to the beliefs that you choose. I was raised Catholic (12 years parochial schools), and have studied other religions, but there is only one true Christian religion (in my opinion) and I'm with it.
I have also come to realize that the actual history of the person we call Jesus was probably quite a bit different from the story one might discern from the Scriptures - the Christmas narrative is just made-up nonsense - but they got the meat of it right.
The "death of religion" in this country - again, my opinion - is the result of a lazy, uninvolved population, most of whom think, when you get right down to it, that THEY are "god," and can decide for themselves what is right and wrong.
And of course, Leftism is evil. One must never forget that.