"Will people who have never heard
the gospel all go to hell because they haven’t
heard about Jesus Christ?"
No one will go to
hell because they haven’t heard of Jesus Christ.
The heathen will go to hell for murder, rape, adultery,
lust, theft, lying, etc. Sin is not failing to hear
the gospel. Rather, "sin is the transgression of
the Law" (1 John 3:4). If we really care about
the lost, we will become missionaries and take the good
news of God’s forgiveness in Christ to them. See
John 16:9 footnote.