How much does the medical assisting school you're considering cost? I'd only do it if there's a program at a public community college. I wouldn't go to a for-profit college and pay an arm and a leg for a career that pays so little. (Average $13/hour nationally.) I'd wonder how long it would take to pay for the education.
My niece just finished a medical assisting program at a community college. She doesn't have any experience yet so she's looking for a job as a patient rep for a clinic associated with one of the bigger hospitals. Her prospects for getting a job are pretty good.
I'm sure there are plenty of Catholic hospitals and affiliated clinics where you could work.