The Bible, which is the inspired word of God, explains that we die because we are mortal, and our mortality is inherited from Adam and Eve because they disobeyed God.
Disobedience to God is called sin.
The punishment for all sin is death.
Ezekiel 18:20 The soul that sinneth, it shall die.
Romans 6:23 For the wages of sin is death;
God made us with free choice and with this free choice we all choose to disobey God.
Romans 5:12 Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned:
Ignorance of God’s law, like ignorance of UK law, is no defence.
Contrary to the pagan belief that we have an immortal soul or spirit which continues in a conscious existence after death, the Bible explains that death really is death.
In death our faculties cease to function, and we are unconscious.
Ecclesiastes 9:5 For the living know that they shall die: but the dead know not any thing,
Psalms 146:4 His breath goeth forth, he returneth to his earth; in that very day his thoughts perish.
God has provided a way of escape from sin and death through his Son Jesus Christ.
Jesus Christ, fathered by God through the virgin Mary, lived a life without sin, which we cannot do. He sacrificed his perfect life so that we might have remission of sin and be raised from the dead to eternal life in the kingdom of God. Christ will establish the kingdom of God on the earth when he returns from heaven.
No one goes to heaven other that Jesus Christ; who ascended to heaven after his resurrection from the dead.
Salvation is resurrection to eternal life in the kingdom of God.
To attain to the resurrection of life we must believe and obey the gospel (good news) preached by Jesus Christ and his apostles.
Mark 16:15 And he said unto them, Go ye into all the world, and preach the gospel to every creature. 16 He that believeth and is baptized shall be saved; but he that believeth not shall be damned (condemned).
There is no other way to attain to salvation.
Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
May I suggest that you read:
Your share in God’s promises: https://www.thisisyourbible.com/library/show/181
I hope you find this helpful.