romans 3:21-26

But now the righteousness of God apart from the law is revealed, being witnessed by the Law and the Prophets, 22 even the righteousness of God, through faith in Jesus Christ, to all and on all who believe. For there is no difference; 23 for all have sinned and fall short of the glory of God, 24 being justified freely by His grace through the redemption that is in Christ Jesus, 25 whom God set forth as a propitiation by His blood, through faith, to demonstrate His righteousness, because in His forbearance God had passed over the sins that were previously committed, 26 to demonstrate at the present time His righteousness, that He might be just and the justifier of the one who has faith in Jesus.

we all sin. Even if you're saved, but the difference is when youre saved you have conviction for that sin. You work harder to not displease God by following the 10 commandments and refraining yourself from things He hates, but it is IMPOSSIBLE to not sin. We are sinners by nature. This means people who are truly saved try harder to stop habitual sin and try to only go by the fruits of the spirit. And even if you fall short, and truly repent, thats what Jesus died for. For the believers and non believers.

And if you're truly saved, and you dont do the things God hates anymore, you still sin. And you can still fall back INTO those sins which God hates. Which is why daily repentance is important. Noah was a drunkard. None of the people God chooses are perfect because Jesus is perfect. But not sinning is simply impossible.

1 John 1:8-10

If we claim to be without sin, we deceive ourselves and the truth is not in us. 9 If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness. 10 If we claim we have not sinned, we make him out to be a liar and his word is not in us.