Christians are not sinners. They are children of God. Sinners are slaves to sin and their master is the devil.
John 8:34-36
Jesus answered them, “Most assuredly, I say to you, whoever commits sin is a slave of sin. 35 And a slave does not abide in the house forever, but a son abides forever. 36 Therefore if the Son makes you free, you shall be free indeed.
We can all quote scripture to support our position.
Rather than do an enlist Bible quoting competition, I have one question for you.
In the light of how Jesus refunded sin in the sermon on the mount. ( Not literal obedience but spiritual obedience of the principles in the law )
Do you obey the ten commandments ie.
Do you love the Lord your God with all your mind, soul and strength and do you love your neighbor as yourself.
Anything less than this is sin.
1 John 3:8-9
8 He who sins is of the devil, for the devil has sinned from the beginning. For this purpose the Son of God was manifested, that He might destroy the works of the devil. 9 Whoever has been born of God does not sin, for His seed remains in him; and he cannot sin, because he has been born of God.