If one thinks they are not a sinner... They are guilty of the sin of pride.
The devil couldn’t lust... But he sure could commit the sin of pride.
Those gully of pride are those who think they don't need a Savior - they can save themselves for they see themselves as good. They are unable to humble themselves.
I was a sinner who was saved by grace. Jesus died for my sin nature and I am now 'in Him' ..."Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new." 2 Cor.
But he sure could commit the sin of pride.
Just like all those who are not 'born again of the spirit' and are so unteached they don't know true Christianity and therefore are 'useable' to Satan with their lack of knowledge.
Reminder: I am who Christ says I am in His Word. What you or others think or say means squat. That will pierce the Christianity lite and prideful sinner.