After two millennia, Christianity remains unshaken, its foundations strong enough to withstand the toughest intellectual challenges. But questions still linger: Can science and Scripture coexist? Do miracles defy the laws of physics? Is Christian experience more than just a feeling? And why does a loving God permit suffering and evil? For twenty-five years, Paul E. Little tackled these twelve most common objections to faith in university settings, and his clear, reasonable responses have resonated with over a million people. Little's approach is engaging and humorous, using "sure-fire jokes" and relatable anecdotes to nudge readers into re-examining their worldview, whether rooted in scientific determinism or existential angst. By grappling with these challenges, believers can emerge with a deeper certainty, ready to engage others with confidence. This revised and updated edition, crafted with input from science and archaeology experts, offers a twenty-first-century perspective and a study guide for individuals or groups, cementing Know Why You Believe as the go-to resource for Christian apologetics.