In order to defend faith, you must know the faith.
Every other year, I teach a class on worldviews to my 11/12th Bible class (this is the off-year). The curriculum is the Understanding the Times series by David Noebel and Summit Ministries. As part of their ministry they have some encapsulizing statements about a whole range of worldview topics that you will find instructional. There is no cost to view these files.