You asked: "Why is it easy for me to believe that... ?" Process of elimination. If all is erased, then that eliminates any rational reasons for confidence in this theory because there is no possibility for information passed on outside of those parameters.
That leaves supra-rational or emotive reasons, right? I think the key is: 'easy'. Which is why I went with zen, in my original answer. It's least effort, literally easy. Although since you didn't answer my questions about being gifted with prophecy, I wonder if that's playing a part in this as well. It's natural to avoid admitting this in public because of the risk that people would mock and ridicule.
It's certainly a rewarding feeling to feel like God has gifted prophecy, making the individual feel special and possessing priviledged divine knowledge and understanding that others don't have. This would make it easy to believe, because it feels good to believe that one has been chosen to recieve this gift and others haven't.