Maybe 10 or 20 nationwide would be what you would expect if you had a strong religious upbringing. Many of these are newer, and not founded by religious orders. Some are a bit kooky or tradish. Obviously any Jesuit, Dominican, etc, colleges are secularized. It’s often the name, background, reputation and charming campuses that keep these going. Someone wrote a book on colleges that are authentically Catholic.
The Dominican’s are not the Jesuits. My daughters went to a Catholic HS run by the sisters from Nashville and it is a fabulous, faithful school. My Sistter went to PC and is sick about the latest development