Mag, if you never saw the color purple, how would you know what it looked like? You can have 1,000,000 people describe it to you and still you would only have a "concept", unless you saw with your own eyes. This can go for other beings and the Bible as well. If you weren't there thousands of years ago, how do you know what was written down was true?
Let's make this personal.
When is the last time you had a close encounter?