What they mean when they say "catholic" they mean to say "inclusive" and that God is the patron of "diversity" in the world:
Marquette University’s objectives are understood against the backdrop of our Catholic, Jesuit mission and vision. Because Catholicism at its best seeks to be inclusive, Marquette is open to all who share its mission and seek the truth about God and the world. Academic freedom is the necessary precondition for that search, and accordingly Marquette welcomes and benefits enormously from the diversity of s eekers within our ranks, even as we freely choose and celebrate our own Catholic identity.
There you go, from Dean Holz trained as a scientist:
Watch out for deans “interested in structure/function studies of metalloenzymes, which includes the design, synthesis, and characterization of small molecules that function as potent inhibitors” and publish “more than 90 research articles on biological inorganic chemistry.” They may have other para-potencies.