How do I reverse a Roman Catholic baptism, and a confirmation ?

When asked if I would route out evil I said no. I didn’t want to have to fight the Catholic school board for not being just and fair (basically evil to me) . I only went to the group confirmation because I wasn’t alowed to go to high school without being baptised and confirmed to the Roman Catholic Church. I would miss my friends. I got away with saying no because it was with a group of people. Do atheists have an undo baptism?