If there is no soul, if there is no immaterial self, [then] there is nothing to survive the death of the body.
If there is no soul, [then] you are your body. When you die, that is, when your body dies, that’s it.
And if you are your body, and when your body dies you die, then there is no afterlife.
And if there is no afterlife, [then] there is no final reckoning of justice.
And if there is no final reckoning of justice, [then] there is no hell and there is no heaven.
And if there is no hell and if there is no heaven, [that is], if there is no hell to be saved from and there is no heaven to be saved to, then there is no need for a Savior to save you from one for the other.
And if there is no need for a Savior, then there is no need for Jesus.
And if there is no need for Jesus .., then Christianity is [finished] because Christianity is not built on a teaching, Christianity is built on a person…
[And] if you take Jesus out of Christianity, [then] you have no Christianity because the sine qua non of Christianity—one of them—is that Jesus is the Savior, the Son of God, who came to earth to rescue us from our sins.
And [Jesus] is, therefore, necessary in the equation of [the] final reckoning of justice for heaven and hell—which requires souls!
If there is no soul, there is no Christianity.
— Greg Koukl, from The Invisible Man Part 1 at 8:15