Aura, I went to the College website (http://www.uchastings.edu/student-services/student-orgs/index.html) where I find 60 student groups listed - each with a particular focus and/or interest.
The logic of the SC decision is that none of them my exclude from leadership students who disagree with the stated purpose of the group. Essentially the Court has decreed the end of diversity. Henceforth all organizations must be anything, while none may be something in particular.
Don't let Liberal pundits mislead you. The only group that has been banned is the Christian group, and no one at the school is applying the SC decision to any other part of the College program. This is targeted anti-Christian discrimination. Period.