There are plenty of good books out there. There is no lack of quality Christian books for both an academic and popular audience. Having said that, there are a few books that I go back to again and again.
How to Read the Bible for All It’s Worth is the classic on how to interpret the Bible. This is the basic skill that all Christians need.
Fabricating Jesus both responds to recent attacks on Jesus and provides the tools to respond to future attacks. If we don’t get Jesus right, we have gotten everything wrong.
Tactics is an incredible resource on how to communicate with skeptics. We can have all of the information but if we cannot express ourselves, then we are of no use.
If you have not picked up these three books, now is the time to do it. If you are just starting out on the journey of becoming a more engaging Christian, these three books will get you well on the way.