Alvin Plantinga is a noted American analytic philosopher who has written in the areas of philosophy of religion, metaphysics, epistemology, and apologetics. Plantinga's Christian commitments are a crucial part of his philosophical work since nearly all of Plantinga's writings have focused on explaining and defending Christian beliefs. He argues that there is no objection or set of objections that shows that Christianity is epistemically lacking, and as such, Christians can be fully rational, justified, and warranted in their religious beliefs. This Element discusses his work as a whole, and focuses on his contributions on the problem of evil, religious knowledge, science and religion, and Christian philosophy.