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An apologist is one a person who defends Christianity through argument and discussion.  The apologists of the first few centuries of Christianity after Jesus played a very significant role in defending the faith against unorthodox teachings. Some of the more famous ones include [[Irenaeus]] who defended against [[Gnosticism]] (an exclusive cult where matter was taught to be evil) and [[Athanasiadus]] who wrote strongly against [[Arianism]] (the teaching that Jesus was a man only, and not God). More recent apologists include thinkers like [[C.S. Lewis]] who have defended Christianity in books such as [[Mere Christianity]].