Christianity alone teaches that our only way for reconciliation with God is by his grace that is received through faith.
"The way of Cain" describes any religious system that attempts to earn God's favor by works and rituals rather than reliance on God's grace.
I share five scriptural insights that lead me to the conclusion that those who are incapable of trusting in Christ on their own are still welcomed into heaven the same way you and I are welcomed into heaven: by the grace of God.