Karl Keating is founder and senior fellow at Catholic Answers. He is the author of seven books, including the recently published The New Geocentrists and the forthcoming The Ultimate Catholic Quiz. His books Catholicism and Fundamentalism and What Catholics Really Believe have been national best sellers.
In answering objections to Catholic teachings, John Martignoni himself relies on Scripture alone, citing chapter and verse the same way Bible Christians do when they talk about their beliefs. Once you learn the Scriptures Martignoni cites, you'll easily discuss these issues with Bible Christians—and influence them in ways you never could before.