That's not what the bible says. It says IF we sin. What you just said is what the Calvinists/Christian gnostics believe, who think that free will is dead and they are compelled by nature to sin, and they
must sin (t̶h̶e̶ ̶d̶e̶v̶i̶l̶ ̶m̶a̶d̶e̶ ̶m̶e̶ ̶d̶o̶ ̶i̶t̶ the sin nature made me do it).
My little children, I am writing these [things] to you in order that you may not sin. And if anyone sins, we have an advocate with the Father, Jesus Christ the righteous [one], 1 John 2:1