speaking as a member of SDTnot all of chapter are exclusively jewish, but i will admit many, many are. Down here at USF we are so not jewish for the most part...its almost humorous. When We were on Spring Break this past year, we met some guys from American and they asked our affiliation, when we told them we were SDT's they looked us up and down, and go "you must not have a very jewish chapter!"
To say that it was wrong to keep chapters jewish in my opinion is not a bad thing. SDT IS a jewish sorority, founded on jewish ideals. It was founded by 7 AMAZING woman who no other chapter would give a chance simply because they were jewish. SO they were forced to begin their own sorority. Other chapters can uphold their religious affiliations, we are quite proud of ours. (and I'm not even jewish) Why should a jewish woman have to endure a christian based ritual simply because people want rush to think that religion doesn't impact rush. Everything impacts rush, looks, money, clothes, what you talk about, how you talk.
While we don't search out for the Jewish people, its more the other way. They are aware that we are a jewish house and want to join. Think about going through, the houses you were intrested in you put more entusiam into attending, where the houses you were just waiting to get dropped from you weren't rude but you were kind of like whatever.
I think that to drop people because they aren't jewish is kind of messed up but if everyone's going to Temple to celebrate Passover and you're going to Church to celebrate Easter you're probably going to feel a little weird about the situation.