The unexamined life isn't worth living anyway .. and everyone has unexamined beliefs that they tie themselves into knots over. Though I think the point of self examination, isn't nihilism, but clarity.
Most Western people believe in linear time, that we have one life only, and think that time passes them, not them passing time. Many Eastern people believe in circular time, and that we live many lives. Most people assume they are alive, that they are conscious, that they are good. These are all unjustifiable assumptions. Consider that you might in fact be dead, a zombie. In Greco-Roman afterlife, most people ended up in Hades, as a kind of ghost, but some also believed in reincarnation after you had drunk from the river Lethe (forgetfulness). This reappears as the Christian Purgatory and Hell. Hell corresponding to the maximum security prison of Tartarus, where the elemental Titans are kept prisoner. How different would you be if you were a Greco-Roman pagan? What if Christianity is a form of Jewish-Buddhism, or Catholicism is Roman paganism continued by other means?
My ex was a nun ... so I understand that kind of crisis of faith (fairy tale). In my case, as a Jewish Kabbalist, I am tolerated here as theist comic relief. So this is a kind of Purgatory for me, but nicer than Hades.