There will be no believers in hell. All believers will be saved "yet so as by fire."
I cannot fathom that anyone who meets the contingency of John 3:16 can possibly end up in hell. If "eternal" life is revokable, then eternal punishment would likewise be revokable. If "Eternal" Punsishment is revokable then there was never any need for the cross.
The promise to Adam in the garden was an eternal promise. It was based on a COVENANT. Adam was required to NOT EAT of the tree of knowledge of good and evil. In the day that he did, he would surely die.
God has had such conditions on an eternal covenant in the past.
The conditions of the New Testament(covenant) are: Believe in the Lord Jesus Christ and be saved.
Be a believer and you're saved. Be a non-believer and you're lost.
Amen! Jn.3:36