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The writer speaks much about unbelief and even calls it " SIN " . Them coming out of Egypt into the promise land is as the same as us Christians before we got saved into our promised land and rest in Christ's salvation. Verse 17 of chapter 3 ? They didn't fall in the wilderness because they sinned or broke God's laws, they sinned because they refused to go into the promised land and didn't believe God that the land was theirs to take

Certainly unbelief is a sin and against God's law...it violates the 1st commandment by putting our own opinions and beliefs (a god) before God's.

But scripture is also clear that Israel in the wilderness was guilty of violating many others of God's laws...including idolatry and sabbath keeping.

" But scripture is also clear that Israel in the wilderness was guilty of violating many others of God's laws...including idolatry and sabbath keeping. "

Yes, that is true, but the writer of the book of Hebrews was focused on this sin of unbelief for a reason.
For it was that sin, the sin of unbelfe that kept a whole generation from entering into the promised land and those who didn't make it parished in the wildreness.
It's the one thing that really ticked God off.

Violating God's laws and transgressions where not the reason why God rejected them and forbade them from entering into the promised land.
It was because of their harden hearts and unbelief.
The other sins ? God had already made a provision in a yearly animal sacrifice for them.