Stuart has drawn our attention to the fact that unlike some religions, Christianity is open to investigation and rational inquiry. Here is a great simple illustration of why that is the case by C Michael Patton from the Parchment & Pen blog.
““I am not insane, most excellent Festus,” Paul replied. “What I am saying is true and reasonable. The king is familiar with these things, and I can speak freely to him. I am convinced that none of this has escaped his notice, because it was not done in a corner.” – Acts 26:25-26