Even Pope Francis is preaching based on the Bible.
That's not surprising, since the Church wrote, preserved and canonized the Bible, and because every Mass contains three reading from Scripture (one from the Old Testament and two from the New) which form the basis of the priest's homily.
I would hope the Pope uses the Bible to guide his counsel to everybody. Makes sense. The Reverend Jim Jones, one of those people I happened to know on my way up ~ (bwahahahaha) ~ misused the Bible.
So it may be claimed, but that is not his supreme authority, not is warrant from it determinative of doctrine, while he seems somewhat loose in his theology, and some are alarmed at his off the cuff remarks. http://www.freerepublic.com/focus/f-religion/3023264/posts