This is a well-documented examination of the influential writer C.S. Lewis, who is loved with an equal fervor by “conservative evangelicals,” hell-denying emergents, Roman Catholics, Mormons, and even some atheists. We examine Lewis’ weak conversion testimony, his heresies, and the reason why he is so popular today. The heresies include his denial of the inerrant inspiration of Scripture, rejection of the “penal substitutionary atonement,” prayers for the dead, purgatory, theistic evolution, hell as a state of mind, and the possibility of salvation without personal faith in Christ and of finding salvation after death.