How can people that were born before Jesus and never heard of him go to heaven?
God knew us from before the foundations of the earth. We were
written in the lamb's Book of Life before God ever even created the
world. God is omnipotent, Alpha and Omega, He knows the beginning
to the end. When Jesus gave his life on the cross for his elect, it
was from the beginning to the end. Remember Jesus is Emmanuel,
translated as 'God with us'. Because before there was Christ there
was still God. They don't go to Christian Heaven. They go to their
own heaven (if promised by their own religion) instead.