Because people's hearts will wax cold as the time for The Lord's coming approaches. Evil is more rampant, the love of money is extreme, love of self and rebellion in general. We idolize ourselves and love pleasures of the moment more than our creator as that time approaches. We were forewarned of this type of behaviour increasing and I believe that we are seeing it.
I think compulsory public education has played a large part in blunting the effects of faith-based reasoning. Answers to questions formerly unknown to the common man and left to a clergy to explain from a supernatural perspective, are now increasingly being answered by the enlightenment of scientific discovery that allows the public at large to understand those answers from a natural perspective. Otherwise, people are still free to have as strong a faith as ever. If there is less faith now than before, that is the only viable explanation I can think of.
Because god does not belong any more. He has served his purpose in the churches struggle for power. Because ppl are getting wiser as the generations pass; at least about being fooled. Too much information kills bogey men and the internet is filled with it. Because a god of fear is no god at all. How long have they waited and much longer more for his return? It's the same story every generation and it's getting old for ppl like me. Because when this is all over with they will not need you to believe in god to control you any more. And because god is dead never to return. A passing fad like Elvis or disco. Not really a king and not really a genre but ppl believed it while they were here and for time after. And most of all because he is no where and that is obvious and people are starting to see that with a disillusioned eye. No one has returned from the grave and ppl lie but no one can tell you what is beyond death because death is the lack thereof the beyond.
You feel that way because it is what you are told by the Lame Stream Media. Catholicism is the fastest growing religion in the world because most people do realize that God created us and Jesus died on the cross to save us. Secularists yell louder, but cry more. Atheists make up approx 2 % of US population. Liberals tend to lean away from God so they can get Far Left and homosexuals to vote for them. Liberals make up about 12% of US population.