Simply exercise your religious freedom outside of the campus. Tufts isn't violating TCF's religious freedom. They're saying, in the face of conflicting principles, you can't discriminate against students and be a student group. The Catholic chaplain at Tufts subscribes to similar logic. No one sees it as a religious issue.
Any group has the right to believe what it wants, but student groups have to follow student rules.
Father O'Leary does not see the TCUJ ruling as a threat to the Tufts Catholic student group. I'm not at all concerned. No Tufts student group has backed TCF yet, but Thor Halvorssen, director of the Philadelphia-based Foundation for Individual Rights in Education, said that a Tufts student concerned about her religious organization's fate has sought his advice. The conflict revolves around Julie Catalano, a junior psychology major who is gay. She was a Bible study leader during her sophomore year and facilitated a women's accountability group this year.