At 67, I have lived a lot, and thought a lot about this very question. When I was younger, 20-25 years ago, I would not have doubted. But now I am starting to doubt because I have prayed for God's help, but not once have I received any answer. I have been taught He is a jealous God, that He wants our total attention, and belief in Him. Yet, I am human too, and with out two-way communication and absolutely no response, my faith is waning, and the realization that God and Jesus are not only Extra-terrestrial, but a collection of preachers, pastors, and what I have read in the Bible. We are also chastised for losing faith, or even questioning God. But I'm afraid this just drives me to question even further. My mother passed away 13 years ago, and always thought she would not die, and now I am realizing I will die too, still no God or Jesus in site, nor the resurrection. So after further debate and doubt, I have no proof of life after death, and no proof of God's existence---yet I can't believe all we on Earth has happened with out Grand design. And that in-itself doesn't prove one way or another.