But the mear idea of punishment being carried out in the afterlife seems like a threat " do this or next heaven"
However, that ' afterlife ' teaching is: that ' the dead are more alive at death then before death' is Not scriptural.
Afterlife is Not a Bible teaching, but future resurrection is.
Jesus and the old Hebrew Scriptures teach the dead are Not conscious in death.
Jesus taught at John 11:11-14 that the dead are in a 'sleep'-like state.
Jesus, being well educated in the OT knew the 'dead sleep' from Psalms 115:17 and Psalms 146:4
Plus, Ecclesiastes 9:5 teaches the dead know nothing. ( No afterlife in death )
Isaiah 38:18 also did Not believe in afterlife but in unconscious sleep for the dead.
False clergy (Not Scripture) teach the threat of burning forever.
King James version translated the word Gehenna into English as hell fire.
Gehenna was a garbage pit outside of Jerusalem where things were destroyed forever Not burning forever.
So, Gehenna stands for ' destruction '. Just as if you threw something into a fire place is gone forever.
That is why the Bible teaches that the wicked will be 'destroyed forever' and Not burning forever at Psalms 92:7