Required Doctrine of Christianity
Everybody physically and materially dies in this world someday. But this death of the body in this world is not the final death. For example, Christ Jesus was killed on the cross but was resurrected as a spiritual entity three days later with a spiritual body that can work even as a body of a living man.
According to teaching of Christ Jesus, the second or final death occurs after one's soul that has entered into the afterlife is condemned to the hell where the God destroys every evil soul to nothingness. But, souls of poor men recognized as faithful would be allowed to enter into Heaven where eternal life is given.
Revelation 20
12 And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.To save people from this severe fate, Christ Jesus told people to be poor so that they will not sell their souls to Satan promising them to make them rich and happy in this world, since selling one's soul to Satan means to accept and perform every evil thing Satan teaches.
13 And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works.
14 And death and hell were cast into the lake of fire. This is the second death.
15 And whosoever was not found written in the book of life was cast into the lake of fire.
This is simple and reasonable. Even poor fishers, farmers, shepherds, tax collectors, etc. living in Palestine 2000 years ago could understand. That is why teachings of Christ Jesus were accepted by many people even in the Roman Empire and thereafter.
1. Everyman dies but his soul survive material death to go to the spirit world.
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John 9, King James Version
18 But the Jews did not believe concerning him, that he had been blind, and received his sight, until they called the parents of him that had received his sight.
19 And they asked them, saying, Is this your son, who ye say was born blind? how then doth he now see?
20 His parents answered them and said, We know that this is our son, and that he was born blind:
21 But by what means he now seeth, we know not; or who hath opened his eyes, we know not: he is of age; ask him: he shall speak for himself.
22 These words spake his parents, because they feared the Jews: for the Jews had agreed already, that if any man did confess that he was Christ, he should be put out of the synagogue.
23 Therefore said his parents, He is of age; ask him.
24 Then again called they the man that was blind, and said unto him, Give God the praise: we know that this man is a sinner.
25 He answered and said, Whether he be a sinner or no, I know not: one thing I know, that, whereas I was blind, now I see.