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The greatest of all sin is ?

The great biggie that caused all mankind to fall in the garden of Eden ?
When satan planted doubts into Eve's mind ? when he said " Hath God said ? "

The great big all time ( sin, singular ) of man kind that all ( sins, plural ) derive from ? unbelief of God and in God.
The writer of the book of Hebrews goes into this a lot in talking about how the children of Israel because of unbelief did not enter into God's rest for them into the promised land.
The book of Hebrews says, that unbelief is in fact a sin and it angered God greatly that he swore with a oath that they would never enter into the promised land because of their unbelief and hardness of heart because of unbelief.
Anyone wonder what the writer of the book of Hebrews means when they said " If we willfully continue to sin after we have received the truth " ? well ? the book of Hebrews writer already told us what that sin is...... unbelief.
For if we continue to willfully not believe the message of the cross and Christ's anointing work on that cross through his blood, the truth of Jesus Christ, if we continue to reject it, defy it, resist it, and continue in that ? there is no more sacrifice for sins available for you and will receive the wrath of God.

Hebrews requires embracing the entire narrative to parse it out intelligibly. The part you quote talks about discipline that God metes out on a local scale to disobedient, yet still saved, believers. They will be given a hellish experience, a sample of what it would be like to live without salvation, in order to teach them that their proper progress is towards heaven, not towards hell. I am confident about that reading because God put a very mulish me, personally, through such an ordeal. It makes sense, especially given that the Hebrews narrative ends up telling its audience that they are destined for better things. Nothing like having been there and done that to understand!