I don't need to explain these scriptures away. I instead properly harmonize scripture with scripture before reaching my conclusion on doctrine. I hope this lesson in Biblical hermeneutics below helps.
Greek scholar AT Robertson has a thorough explanation for you.
Sinneth not (ουχ αμαρτανε). Linear present (linear μενων, keeps on abiding) active indicative of αμαρτανω, "does not keep on sinning." For μενω (abide) see 1 John 2:6; John 15:4-10.
Whosoever sinneth (ο αμαρτανων). Present (linear) active articular participle like μενων above, "the one who keeps on sinning" (lives a life of sin, not mere occasional acts of sin as αμαρτησας, aorist active participle, would mean).
Hath not seen him (ουχ εωρακεν αυτον). Perfect active indicative of οραω. The habit of sin is proof that one has not the vision or the knowledge (εγνωκεν, perfect active also) of Christ. He means, of course, spiritual vision and spiritual knowledge, not the literal sense of οραω in John 1:18; John 20:29.
Doeth no sin (αμαρτιαν ου ποιε). Linear present active indicative as in verse 1 John 3:4 like αμαρτανε in verse 1 John 3:8. The child of God does not have the habit of sin.
His seed (σπερμα αυτου). God's seed, "the divine principle of life" (Vincent). Cf. 1 John 3:1.
And he cannot sin (κα ου δυνατα αμαρτανειν). This is a wrong translation, for this English naturally means "and he cannot commit sin" as if it were κα ου δυνατα αμαρτειν or αμαρτησα (second aorist or first aorist active infinitive). The present active infinitive αμαρτανειν can only mean "and he cannot go on sinning," as is true of αμαρτανε in verse 1 John 3:8 and αμαρτανων in verse 1 John 3:6.
1 John 3, Robertson's Word Pictures in the New Testament, Robertson's Word Pictures of the New Testament is a rich resource for understanding Scripture, delving into original language and cultural nuances.
www.studylight.org
1 John 2:3 - By this we know that we have come to know Him, (already know Him/already saved/demonstrative evidence) if we "keep" (Greek word "tereo" - guard, observe, watch over) His commandments. 4 The one who says, “I have come to know Him,” and does not keep (guard, observe, watch over) His commandments, is a liar, and the truth is not in him. This does not mean flawlessly obey the 10 commandments 100% of the time under the old covenant of law (sinless perfection) which ONLY Jesus Christ has done. (Ecclesiastes 7:20; Romans 3:23; Hebrews 4:15; 1 John 3:5)
1 John 1:6 - If we
say that we have fellowship with Him, and
walk in darkness, we
lie and do not practice the truth. But if we walk in the light as He is in the light, we have fellowship with one another, and the blood of Jesus Christ His Son cleanses us from all sin.
*Walking in darkness is descriptive of children of the devil. Walking in the light is descriptive of children of God. Only those who are saved/believers are in the light.
Acts 26:18 - to open their eyes, in order to
turn them from darkness to light, and from the power of Satan to God, that they may receive forgiveness of sins and an inheritance among those who are sanctified by faith in Me.
2 Corinthians 6:14 - Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And w
hat communion has light with darkness?
Ephesians 5:8 - for you were
formerly darkness, but now you are Light in the Lord; walk as children of Light. Children of the devil walk in darkness, not in the light. Children of God walk in the light, not in darkness. IF confirms these positions in verses 6 and 7. It's one or the other.
In 1 John 2:9, we read - He who
says he is in the light, and
hates his brother, is in darkness until now. In vs. 11 - But
he who hates his brother is in darkness and walks in darkness, and does not know where he is going, because the darkness has blinded his eyes.
*Compare with 1 John 3:10 - In this the
children of God and the children of the devil are manifest: Whoever
does not practice righteousness is not of God, (compare with 1 John 1:6 -
does not practice the truth) nor is he who
does not love his brother.
*Notice that
walks in darkness, hates his brother is descriptive of
children of the devil.
Keep reading.
And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous. 2 And He Himself is the propitiation for our sins, and not for ours only but also for the whole world. *So much for sinless perfection.