I myself didn't know much of anything about holy scriptures. I was in my late 20's before I started studying the Bible or came to believe it is true.do we claim to 'know' the heart of another and say bad things about them and yet get upset at others claiming to know our hearts? this is a double standard.
but if Jesus were here - He would know our hearts, would He not? the Bible tells us to be careful to entertain strangers, because we may be entertaining Angels unaware.