Without a Doubt: Answering the 20 Toughest Faith Questions

by Kenneth Richard Samples

Always be prepared to give an answer.

One of the unique aspects of Christianity is that it stands up to honest intellectual scrutiny. Without a Doubt offers solid, succinct answers to twenty classic questions that challenge the Christian faith,

-God's existence
-creation and the universe
-the historical veracity of Scripture
-Jesus Christ's true identity
-God as Trinity
-faith vs. science
-God and evil
-Christianity and other religions

Authorities ranging from prophets and philosophers to scientists and the Scriptures provide rational explanations and compelling evidence for those who have questions about their faith or question faith altogether.

"Samples exhibits the virtues of charity and intellectual integrity along with a deep understanding of the sorts of challenges to the Christian faith that are offered in our contemporary world and must be met by the serious Christian. Without a Doubt is a wonderful work."
—Francis J. Beckwith, Baylor University, author of Relativism

"Without a Doubt fills a specific void in the apologetic literature. It brings together very careful research with a reader-friendly style. A great read for anyone interested in answers to some of life's most puzzling questions."
—J. P. Moreland, Talbot School of Theology, author of Love Your God with All Your Mind

"Rarely does one find such an array of issues and quality responses under one cover, all ready for personal use or in addressing questions or challenges."—Gary R. Habermas, Liberty University, author of The Historical Jesus

419 pages, Kindle Edition

Published March 20, 2026

About the author

Kenneth Richard Samples serves as a senior research scholar at Reasons to Believe (RTB). He earned a BA in social science with an emphasis in history and philosophy from Concordia University and an MA in theological studies from Talbot School of Theology. Before joining RTB, he worked as senior research consultant and correspondence editor at the Christian Research Institute and regularly cohosted the popular call-in radio program The Bible Answer Man.

Kenneth is the author of many books including Clear Thinking in a Messy World, Christianity Cross-Examined, and Classic Christian Thinkers. Additionally, he is an adjunct instructor of apologetics at Biola University and has spoken at universities and churches around the world.