Many Christians have trouble defending the faith. Yes I used the words “the faith” since the Bible references it that way (Acts 16:5; 1 Corinthians 16:13; etc.). It is beneficial to study Christian Apologetics, a way to defend the faith against objections. The book that I’ve linked to the left is one that I have read recently. It is a very good book with many interesting points and arguments for the faith. The only problem I have, as with many religious books, is that the author throws his own spin on salvation instead of using God’s word to show someone how to be saved. He regurgitates man’s doctrine of salvation and doesn’t provide the whole of what the New Testament teaches. I will work up an article on salvation with just scripture and will link it here later for your reading.

Added 04/18/2014 as promised: Salvation According to the Bible