Providing quality experiences to enrich the lives of the community at large with award-winning preschool programs, summer camps and a wide array of enriching activities. JCC Chicago provides the opportunities to bring Jewish values to the lives of everyone from infants to adults.
A great way for Jewish professionals and volunteers who work with and provide programming for people in interfaith relationships to locate resources and trainings to build more welcome into their Jewish communities; connect with and learn from each other; and publicize and enhance their programs and services.
There is nothing wrong with the fact that you were brought up as a Catholic. People who don’t know that you weren’t always Jewish may think it strange if you wear your college sweatshirt (so you might provoke strange reactions), but there is no reason that you should feel that you need to hide that you went to a Catholic college. And I think you should contribute to your high school if you wish. People contribute money to many causes that they themselves are not a part of. And in this case you *are* an alumna and you clearly feel that the school provided a good experience for you. All your fond memories of your Christian past do not negate your current Jewish identity—and they are still a part of who you are.
If you are still sometimes worried that your feelings are “inappropriate”, you should discuss it with your rabbi. I expect that your rabbi would reassure you that it is OK to have these feelings. I understand your reluctance—I felt a little embarrassed when discussing some aspects of my past to my sponsoring rabbi when I was studying for conversion. However, my rabbi is extremely empathetic and I have always felt better after talking to him about my concerns about many different topics.
I’d like to add that there are Jews by Birth who attend Catholic colleges too. An observant JBB woman in my minyan got her masters degree at Loyola University in Chicago. And there are clearly a number of Jews who attend Loyola because Loyola has its own Hillel. Conversely, there are are non-Jewish students who attend List College at the Jewish Theological Seminary. So I think you should wear your college sweatshirt with pride.