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1. Conversion of St. Augustine
There were several significant rational turning points in Augustine's life before he came to Christ. First, was reasoned out of Manichaean dualism. One significant turning point here was the success of a young Christian debater of Manicheans called Helpidius (see The Confessions).
Second, Augustine reasoned his way out of total skepticism by seeing the self-defeating nature of it (see his Against the Academics).
Third, where it not for studying Plotinus, Augustine informs us that he would not even been able to conceive of a spiritual being, let alone believe in one (see The Confessions).
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2. Conversion of Frank Morrison
This skeptic set out to disprove Christianity by showing the resurrection never occurred. The quest ended with his conversion and a book titled Who Moved the Stone? in which the first chapter was titled "The Book That Refused to be Written"!
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3. Conversion of Simon Greenleaf
At the turn of the century the Professor of Law at Harvard, who wrote the book on legal evidence, was challenged by students to apply the rules of legal evidence to the New Testament to see if its testimony would stand up in court. The result was a book titled The Testimony of the Evangelists in which he reported his own conversion to Christianity.
