To be honest it indicates a personality that is based around intellect, intelligence and science™ as the main pillars of psychological stability. Quite often it is a defensive reaction to a religious upbringing as a child.
I was just talking to my girlfriend about this. I was brought up religious as a child. Going to college was my first experience around a diverse set of religious beliefs, including many non-believers. It only took a few months for me to lose my faith, which came as a shock to me, because I had felt so sure about my world view only a short time before. So I lost my confidence in feelings of confidence alongside my faith. I replaced them both with a very deliberate set of beliefs in things like science and logic.
Same with me and I wish I would have been exposed to philosophy earlier in my life. Science provides us with the tools to denounce certain religious facts but it can not give us our confidence back. This also explains the rise of pseudo-intellectuals (people publicly arguing outside of their field of expertise) who are filling this gap with nonsense.
Though I didn’t exactly loose my faith, I can relate. I am not sure about anything, really. I was exposed earlier in life to science and non-believers.