Not surprised about the small number of Catholics as Biblical Literalists. Catholocism is not a Biblically Literal religion. In fact, one of the more famous statements (and of course, controversial) by John Cardinal Newman is “Biblical literalism is the mother of all heresy.” It is not how we roll. We have four interpretations of Scripture: Historical, Analogical, Ethical, and Anagogical. Literal would get in the way of that.
But note that Catholics that are Biblical literalists (11.8%) hold more conservative political views than the Catholic population in general does. The Biblical literalist Catholic is as politically conservative as the Biblical literalist who is Evangelical (47.8%) or Mainline Protestant. (11.2%)