Not Fighting Satan must Mean Betraying the God
It is true that Christ Jesus talked about fear of death, soul, and the hell:
Matthew 10, King James Version
28 And fear not them which kill the body, but are not able to kill the soul: but rather fear him which is able to destroy both soul and body in hell.
His words also imply existence of the God and Heaven.
Followers of Christ Jesus is enemies of Satan who hates the God and Christ Jesus. Accordingly Satan tries to kill followers of Christ Jesus. But it cannot kill the souls of the followers of Christ Jesus. However, the God or Christ Jesus can destroy bodies and souls of followers of Satan in the hell to erase their existence and annihilate them. And Christ Jesus would say that they should not have been born.
This might look like a fantasy, but to believe in Christ Jesus and the Bible means to believe his words.
Conversely, if we follow Christ Jesus and get saved by Him, our bodies and souls should be allowed into Heaven.
However, Heaven is not a material world like the hell is not. We cannot see the God and Heaven in the same manner we see material things and phenomena. Even when we die, we can preserve our souls. Even Satan can stop our souls from entering into Heaven. We, each, will have the spiritual body and soul after death. Even Satan cannot kill our souls, but the God can destroy bodies and souls of followers of Satan in the hell.
So, if men could actually see the spiritual world, they should all follow the God and leave Satan because of the fear of being annihilated by the God in the hell. However, it seems that the God does not want men to see the real states in the hell and accordingly follow Him due to the fear. But the God seems to see us follow Him without seeing the actual states in the hell.
Those who can live forever in Heaven and others who are destroyed to be nothing in the hell are very different. Followers of the God and other followers of Satan are very different. The God and Satan are very different from each other. Heaven and the hell are so different from each other.
The important issue is that Christ Jesus recommends us to fear the God. If we are not 100% completely following the words of the God, we cannot claim that the God should love us, save us, and give us happiness, fortunes, and money. Instead, we should think that the God might be angry at us because of our insufficient belief.
Indeed, we have no qualification and right to demand good treatment from the God. We have nothing to offer to the God in exchange. But, as Satan is an enemy of the God, our fighting Satan must please the God. So, Christ Jesus said not to be afraid of Satan but have fear of God.
In this context, the God might have created men as Its soldiers in fight against Satan. So, not fighting Satan must mean betraying the God. If we love money more than the God as we are brainwashed by Satan, we should be annihilated to be nothing in the hell.
This is a reasonable understanding of the words of Christ Jesus.
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John 4, King James Version
6 Now Jacob's well was there. Jesus therefore, being wearied with his journey, sat thus on the well: and it was about the sixth hour.
7 There cometh a woman of Samaria to draw water: Jesus saith unto her, Give me to drink.
8 (For his disciples were gone away unto the city to buy meat.)
9 Then saith the woman of Samaria unto him, How is it that thou, being a Jew, askest drink of me, which am a woman of Samaria? for the Jews have no dealings with the Samaritans.
12 Art thou greater than our father Jacob, which gave us the well, and drank thereof himself, and his children, and his cattle?
13 Jesus answered and said unto her, Whosoever drinketh of this water shall thirst again:
14 But whosoever drinketh of the water that I shall give him shall never thirst; but the water that I shall give him shall be in him a well of water springing up into everlasting life.