Romans 3:23
For all have sinned, and come short of the glory of God.
If you are a human being – you qualify as “all.” Sin is sin, and you are a sinner.
1 John 3:4
Whosoever committeth sin transgresseth also the law: for sin is the transgression of the law.
Sin is the transgression of the law.
1 John 5:10
He that believeth on the Son of God hath the witness in himself: he that believeth not God hath made him a liar; because he believeth not the record that God gave of his Son.
Sin is unbelief – it calls God a liar.
Isaiah 1:2
Hear, O heavens, and give ear, O earth: for the Lord hath spoken, I have nourished and brought up children, and they have rebelled against Me.
Sin is active and passive rebellion against God.

