I don't claim to know what he meant, but I wouldn't be even a little surprised if he considered me to be as much a "fundamentalist" as you are, if not more so.
From the article:
Pope Francis stated that the only thing standing in his way of seeing his Human Fraternity for World Peace and Living Together covenant being realized are those nasty, scourge fundamentalist Bible believers who keep exposing him.
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I've never heard the term "fundamentalist Bible believers" applied to Roman Catholics.