To see how quickly this transformation can happen, take a good look at the philosophy department at many of the leading Catholic universities: what were, in the 1950’s overwhelmingly theistic professoriats are today largely atheist.
And it’s just some passing fact. The kind of thing everyone knows. A tidbit we mention in order to demonstrate some larger point.
When the philosophy department is run by atheists, it’s not Catholic education. If you care about the faith, boycott faux-Catholic schools.