I am a Jewish girl in a nationally recognized Christian Sorority. In my chapter there are about 15 Jewish members. There has never been an issue with missing an event due to a religious holiday etc. We tend not to schedule events during a holiday etc.. If something does occur we are of course excused. A lot of my sisters who arn't Jewish often come to Hillel for events. Hillel even used our chapter room for an event
. I have never been in a situation where I've had to choose my religion over my sisters!