My agnostic/atheist D is at DePaul which is the largest Catholic university in the country. But as far as I can tell, DePaul is hardly religious and is very liberal (though certainly kids seeking religion/Catholicism can find it there). There is a beautiful cathedral on campus with a 6-year waiting list for weddings! You will also find some religious icons around, but it’s definitely not everywhere. The campus was closed on Good Friday, which was a surprise to us non-religious folk, but was a boon, as we were visiting from the West Coast and D was able to join us for the entire day! DePaul is still committed to their Vincentian service mission however, and kids do go out into the community for service projects. My D was involved with a community garden and cooking project in a low-income neighborhood, for example.
My D was accepted to other Catholic universities (I’m not sure how she ended up applying to so many, since we are not religious, but she was seeking merit also), but they (Gonzaga and Saint Louis University) definitely felt more religious and we got the impression that they are filled with kids from Catholic high schools. Ultimately not the vibe my D was looking for.
So I think the Catholic thing feels different, depending on which school you’re talking about. I have no knowledge of Loyola Maryland.