No, they don't quote the Bible, but their own words. Nowhere does the Bible say Jesus returns 'twice', nor comes to earth a 'third' time.As to people writing their own prophecies...No, they quote the bible.
No, they are trying to figure out how to write their own prophecy, while appearing to read the Bible.They're simply trying to figure out the who, what, when, where, why's and how of the prophecy.
And they get so caught up in their own figurings, that they forget people can read and compare their words with Bible words, and see their words are not even in the Bible.
The Bible is not hidden somewhere. We can still read it and see if what people say about it is so, or not.
The only question remains why. No doubt part of it is the fun of intellectual argument for its own sake, rather than just reading the Book, and believing it or not.