This MP3 on Apologetics is an excellent investment for your Theology Library.  It can be used for personal training, group Bible studies, College and even Seminary classes. 

Are all religions true? Each person at one time or another pondered this critical question, Do all religions lead to God? Dr. Geisler offers in this lecture a rational defense that each worldview is mutually exclusive along with the clear evidence that there can only be one faith, one hope and one love.