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The next book I read was Karl Keating's seminal work Fundamentalism and Catholicism. It answered pretty much every question I had regarding the doctrines and practice of the Catholic faith.
I always keep a copy on hand to give away to someone interested in the faith. I have also referred to Karl Keating's organization, Catholic Answers for their excellent apologetics articles and videos at Catholic.com.
They are experiencing a serious financial shortfall this summer and I would ask you to pray about contributing to this great work that builds the Church of Jesus Christ.
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