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Are you asking if you can join an NPC sorority and the Christian sorority? Even if you could, I don't think I would. Both groups will require a lot of commitment and it would probably get overwhelming pretty fast. The NPC rule is you can't join another NPC sorority. Typically that means you are eligible to join a professional or service fraternity as well. But even in those cases I wouldn't recommend you do both at once. Pledge where you feel most comfortable and if after a semester or a year you want to look into the additional sorority, then it should be ok.

You are not in the wrong place. Thank you for researching/answering your own first question.

As to your second quandary, ONE group needs to be given priority. The order you choose remains your choice.

Later you can look-into the second group.

We don't know your campus. We don't know your personal strengths/limits regarding time management.

Good luck.

Thank you very much! :)