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I think that Mere Christianity by C.S. Lewis is probably one of the best apologetics I have read. His argument starts by explaining how we can know that there is a being "above" us. He then follows that argument to how we can know that this being is God, and how we know that chiristianity is true. Then he goes on to explain some doctrine and why we can trust it. Its worth reading if you are interested in intelectual not to "preachy" answers to some questions about chirstianity.