By the way, Robertson should read Deuteronomy 18:19-22 again:
19 If anyone does not listen to my words that the prophet speaks in my name, I myself will call him to account. 20 But a prophet who presumes to speak in my name anything I have not commanded him to say, or a prophet who speaks in the name of other gods, must be put to death."Also check out this post.
21 You may say to yourselves, "How can we know when a message has not been spoken by the LORD ?" 22 If what a prophet proclaims in the name of the LORD does not take place or come true, that is a message the LORD has not spoken. That prophet has spoken presumptuously. Do not be afraid of him.