Moses said the same thing in Deuteronomy, but we don’t throw away everything said after him, including Revelations. The passage is about the revelations of John, not God’s word.
http://www.biblegateway.com/passage/?search=deuteronomy%204:2&version=KJV
I’m sorry, Allon, but God’s Word is His Word, and it is contained in all the books of the Bible. God is big enough to see to His Word, and beginning with Moses and ending with John, Jesus is there throughout, and that same warning applies, because it is a seamless revelation to mankind.
But, as I said to the last commenter, make of it what you will. I’m not going to change your mind.
My original comment was intended for the one who posted this thread—the one who chose to join catholicism. He used to believe the Bible, as the revealed Word of God, without any additional manmade writings and traditions, that we are warned about throughout the Bible.