Well, I am someone that personally debunks this whole argument. I have a great relationship with my father. Always have, he is the number one role model in my life and though he is a Catholic, I am an atheist.
Sorry, but the main reason people "lose faith" (horrible phrase). Is simply because they no longer find the evidence compelling to believe in whatever deity we are speaking of, sounds like Vitz, is a bit guilty of using personal experience as an argument and then finding examples of other nonbelievers that fit his model.