For generations, Samuel M. Zwemer has been known as “The Apostle to Islam.” A pioneering missionary and scholar, Zwemer devoted his life to studying the Muslim world and calling Christians to bring the Gospel to its people. First published in 1907, Islam: A Challenge to Faith became one of the most influential Christian works ever written on Islam. In it, Zwemer carefully examined the origins of Islam, the life of Mohammed, the beliefs and practices of the Muslim faith, and the global expansion of Islam throughout history. Yet his purpose was not merely academic. Zwemer wrote to awaken the church to the spiritual needs of the Muslim world and to encourage faithful Christian witness among Muslims. Challenging Islam presents a modern, condensed edition of Zwemer’s classic work. Carefully edited for clarity and accessibility, this volume preserves Zwemer’s essential arguments while making his insights available to a new generation of readers. Inside this book you will explore: • The historical roots and sources of Islam • The life and influence of Mohammed • The spread of Islam across nations and centuries • Islamic theology, ethics, and religious practices • Divisions and reform movements within the Muslim world • The Christian responsibility to bring the Gospel to Muslims Zwemer believed that Islam posed not merely a political or cultural question, but a spiritual challenge to the Christian church . His answer was clear: the Muslim world must be met with the message of the Cross and the transforming power of the Gospel. More than a historical study, Challenging Islam is a call to prayer, understanding, and faithful mission.