...when you were growing up? I think mine was. Deceit filled my head with a lot of strange beliefs that the adults knew were false but apparently didn't care to correct. I remember having skeptical thoughts from an early age, but they were usually dismissed ("You can't prove my _____ doesn't exist") or discouraged ("Every time someone says, 'I do not believe in fairies,' somewhere there is a fairy that falls down dead," "If you don't believe in Gosh, you'll be Darned to Heck"). This could go on for a while, but I'll keep it short.
What about you? Were your parents and other adults in your life honest with you, or did they often lie to you or gaslight you? Did they encourage you to question things before you believed them, or didn't they?
If you were afraid of monsters in the dark, did they walk you through it to show you that there was nothing to be afraid of, or did they make up even stranger things like magical charms and rituals to keep the imaginary monsters away? Or did they simply repeat to you that there were no monsters and you should stop worrying and go back to bed?
Could "the doubting disease" have resulted from the inner skeptic receiving little or no attention or love, and therefore no direction?