Just go to the Scripture he is talking about. He want dropped on his head to believe That’s is Heaven. Burning in flames of fire is Heaven. It sounds like he has already turned over to a reprobate mind , to believe a lie and be damned. That’s means if he has gone to far , there’s no chance for him. I know God is Merciful. But it sounds as if he has to have great Mercy for him to have a chance. I would be afraid to go to bed at night.