I went to a Jesuit undergrad so I can't say for sure what the med schools would be like, but since I also know people who went to Jesuit high schools I will give this info to be taken with a grain of salt. The atmosphere did not drip with religion amongst the students. Many of the teachers and professors were Jesuit priests, but the subjects taught were all standard (we had a Jesuit teaching a class on evolution which I thought was interesting). There is a leaning towards issues of social justice and ethics, but wasn't done with a focus on religion specifically. In my undergrad we had to take three courses from the religious studies department, but they ranged from in depth looks at your choice of all the major religions to classes dealing with ethics or cultural morality. I would anticipate that the medical schools would probably be more likely to have workshops on the more touchy-feely aspects of medicine, and I would be surprised if they don't have some free clinics and mentorship programs affiliated with the school. However, they are a more liberal group and are more focused on promoting higher education, human rights, and helping the poor that on forcing their views down your throat. I don't think you would feel like an outsider no matter what your spiritual beliefs are.
