I recently re-read The Case For Christ by Lee Strobel. What a great book. It is full of tough questions, and has convincing answers. It provides seekers and believers underpinnings of the Christian faith. I wanted to re-read it in order to have some better answers and some better information to relay around the office I work at.
I recommend this book with my whole heart. If you are a believer it equips you for those conversations with skeptics, and if you are a non-believer it provides info for the questions you may have. Please go pick up a copy.
In closing I leave you with one of my favorite quotes from the book (however, there are many).
This comes from C.S. Lewis, the brilliant and once skeptical Cambridge University professor who was eventually won over by evidence for Jesus,
"I am trying here to prevent anyone saying the really foolish thing that people often say about Him: "I'm ready to accept Jesus as a great moral teacher, but I don't accept His claim to be God." That is the one thing we must not say. A man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic...or else he would be the Devil of Hell. You must make your choice. Either this man was, and is, the Son of God: or else a madman or something worse. You can shut Him up for a fool, you can spit at Him and kill Him as a demon; or you can fall at His feet and call Him Lord and God. But let us not come with any patronizing nonsense about His being a great human teacher. He has not left that open to us. He did not intend to."