The book's title comes from Matthew 17:20–21 (KJV): "Because of your unbelief... Howbeit this kind goeth not out but by prayer and fasting." Hall teaches that certain spiritual problems (demonic strongholds, chronic illness) require more than casual prayer—they demand a lifestyle of faith and often fasting.

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Franklin Hall was a well-known American evangelist and faith healer in the mid-20th century. His ministry was characterized by a strong emphasis on the power of faith and the importance of spiritual renewal. "Because of Your Unbelief" is one of his most famous works, and it has been widely read and debated among Christians. The book's central thesis is that unbelief is a pervasive and debilitating spiritual condition that prevents many Christians from experiencing the fullness of God's power in their lives.

He rightly challenges passive, fatalistic prayer and calls believers to active, expectant faith. His emphasis on fasting as a discipline is biblically grounded (Acts 13:2–3).