The Psychology Behind the Belief in Heaven and Hell

I think that boils down to a single question, that is,What happens after physical death, does soul exist?Now amongst all human knowledge including science and religions, who ever addressed this question and delivered an answer to this question directly?I think that only 'thing' ever addressed this question directly is Christianity, with salvation through the atonement of sins as a solution.God has strict Laws, and if judged by Law we are the dead prisoners. The solution is God as qualified for such a job, atoned for our sins such that we don't need to face the judgment by Law.Science is almost futile about 'what will happen after death'. Other religions don't seem to be able to address it directly. It seems to me that only the Christian God cares so much about what humans will be by sending out warnings, giving out laws and covenant, providing a feasible solution for human soul salvation and etc.

hell is a place where God is absent. people in hell are said to be in a permanent separation from God.When angels are in such a separation, they become devils or satans. I think that's why they are thrown to the lake of fire.When humans are in such a separation, will they be worse?I think that hell may not be reasoned that easily perhaps we miss out something, say, because we don't know what will happen in a permanent separation from God.And I think that if people sinned and yet deny God's offer as a solution, which simply means "people didn't choose God, and God didn't choose them in earth stage". That's why the separation.