1 John 3:7-15
King James Version (KJV)
7 Little children, let no man deceive you: he that doeth righteousness is righteous, even as he is righteous.
8 He that committeth sin is of the devil; for the devil sinneth from the beginning. For this purpose the Son of God was manifested, that he might destroy the works of the devil.
9 Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.
You can try and wiggle yourself out of John’s real insights here...but it will not work.
It is true, there is no temptation too great than that which may be resisted, but that does not entail some believers never sin after salvation.
We still are scarred in our souls from past sinful memories which we recall when facing situations where we sinned in the past.
We also have an old sin nature in our bodies which lead us to sin, even when the new man would otherwise.
In both situations, without appealing to immorality, we frequently sin by not being in the right place at the right time, having followed our personal thinking independent of God, instead of only thinking through faith in Him.
If you have driven 22mph in a 22mph speed zone, without cognition of the infraction, you have still sinned. If you drove 10 mph in a 20mph speed limit zone because you personally want to make sure you do not threaten any children in the area, but do this independent of faith in Christ, you also sin for substituting your guidance of your life for His Plan.
As soon as that happens, we fall out of fellowship with Him, requiring us to change our thinking back through faith in Him and confessing those sins to Him to return back to fellowship with Him, to live by His Plan.