Islam is the fastest growing religion in the world, and there are over 1.7 billion Muslims in 149 countries in the world. Islam now dominates most of North Africa, the Middle East, Central Asia, and Southeast Asia. With the massive number of Muslims all throughout the world, Christians need to be equipped to engage Muslims with the gospel and to defend the faith against Islam. However, this is not a new task. Many brilliant Christian theologians, philosophers, and missionaries have written apologetically against Islam, including Thomas Aquinas. Aquinas is seen as one of the greatest minds in church history, and even secular philosophers consider Aquinas to be “rare philosophical genius.” What was it that drew this philosophical and theological