Aside from Universalists, most Christian traditions contain the doctrine of judgment, although the particulars of how that judgment is carried out varies along a spectrum. Whether it is actual physical torture for all eternity or some sort of separation from God, whether there’s purgatory or a second chance post mortem, there exists a form of judgment within the systems of Christian faith.
Good parenting sensibilities tell us we shouldn’t shy away from difficult truths, and although we try to be age-appropriate, we are obligated to share even the most unpalatable aspect of the Christian faith with our kids. The problem is: children don’t yet have the emotional maturity and logical capability to process a belief in eternal punishment. Their budding minds can’t reason through the theological necessity of judgment in a loving God. So they panic and retreat into fear. In order to coax them out of their distress we comfort them, it’s okay, Jesus will save you, just believe in Jesus.
And so it begins — even as kids develop and eventually learn the nuances of Christian life, they are bearing the invisible baggage of fear that had them gripping for Jesus.