And the LORD God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.
(Genesis 2:7)
All the while my breath is in me, and the spirit of God is in my nostrils;
(Job 27:3)
For as the body without the spirit is dead...
(James 2:26)
Then shall the dust return to the earth as it was: and the spirit shall return to God who gave it.
(Ecclesiastes 12:7)
Behold, all souls are mine; as the soul of the father, so also the soul of the son is mine: the soul that sins, it shall die.
(Ezekiel 18:4)
The Bible uses the term "soul" 1600 times, never once described as immortal.
Marvel not at this: for the hour is coming, in the which all that are in the graves shall hear his voice, And shall come forth; they that have done good, to the resurrection of life; and they that have done evil, to the resurrection of damnation.
(John 5:28-29)
Men and brothers, let me freely speak to you of the patriarch David, that he is both dead and buried, and his sepulcher is with us to this day.
(Acts 2:29)
For David is not ascended into the heavens: but he said himself, The Lord said to my Lord, Sit you on my right hand, Until I make your foes your footstool.
(Acts 2:34-35)
Death is called a sleep 66 times in the Bible.
These things said he: and after that he said to them, Our friend Lazarus sleeps; but I go, that I may awake him out of sleep. Then said his disciples, Lord, if he sleep, he shall do well. However, Jesus spoke of his death: but they thought that he had spoken of taking of rest in sleep. Then said Jesus to them plainly, Lazarus is dead.
(John 11:11-14)
Jesus said to her, I am the resurrection, and the life: he that believes in me, though he were dead, yet shall he live:
(John 11:25)
And when he thus had spoken, he cried with a loud voice, Lazarus, come forth.
(John 11:43)
For the living know that they shall die: but the dead know not any thing, neither have they any more a reward; for the memory of them is forgotten.
(Ecclesiastes 9:5)
His breath goes forth, he returns to his earth; in that very day his thoughts perish.
(Psalm 146:4)
The dead praise not the LORD, neither any that go down into silence.
(Psalm 115:17)
What about the thief on the cross?
And Jesus said to him, Truly I say to you, To day shall you be with me in paradise.
(Luke 23:43)
There was no punctuation in the Koine Greek language.
Was Jesus in Paradise to receive the thief on that day?
Jesus said to her, Touch me not; for I am not yet ascended to my Father.
(John 20:17)
For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first:
(1 Thessalonians 4:16)
And I heard a voice from heaven saying to me, Write, Blessed are the dead which die in the Lord from now on: Yes, said the Spirit, that they may rest from their labors; and their works do follow them.
(Revelation 14:13)
If this is "man's doctrine," then I'm going with it.
Putting a label on it ("soul sleep") and calling it "unscriptural" is meaningless.
Hell is for the disposal of sin and unrepentant sinners. Not for endless torment.
God is love, not sadism.