It dies not show that religion changes. It shows that a particular college that has a religious affiliation changed its method of operation. Nothing in Church Canon changed and the religion does not mandate separation of the sexes in academia.
Chances are that the college:
#1 needed to compete for students, so became co-ed in order to survive
#2 wanted to apply for state and/or federal grants and could no longer discriminate based on gender and get the money
Your comment “compare that to Jewish Frumkeit” is not only wrong, but particularly condescending and mean. There are many Frum day schools that are mixed gender enrollment in the US