It's interesting that you skipped over 1 John 1.
John never contradicted the basic truth of the Gospel: our sins have been forgiven because of the crucifixion, which paid the penalty for all sin for all people for all time. Please understand this: our sins have been forgiven. Anything to the contrary denies the efficacy of Christ's sacrifice!
BTW, Matthew (and the other gospels) were written to unbelievers, not to Christians.
Which Only Proves The Two Different Gospels. Yours you know.
Versus the one you don't.
One thought, joined by "therefore", makes the Kingdom Law these Commandments.
Matthew 5:18-19 For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the Law, till all be fulfilled. Whosoever
therefore shall break one of these least Commandments, and shall teach men so, he shall be called the least in the Kingdom of Heaven: but whosoever shall do and teach [them], the same shall be called great in the Kingdom of Heaven...
John 14:15 If ye love Me, keep My commandments.
The Real Unbelievers
Matthew 13:2 And
great multitudes were gathered together unto him, so that he went into a ship, and sat; and the whole multitude stood on the shore. ... 13 Therefore speak I to them in parables: because they seeing see not; and hearing they hear not, neither do they understand. 14 And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive: 15 For this people's heart is waxed gross, and [their] ears are dull of hearing, and their eyes they have closed; lest at any time they should see with [their] eyes, and hear with [their] ears, and should understand with [their] heart, and should be converted, and I should heal them.
The Real Believers
Matthew 13:10 And
the Disciples came, and said unto Him, Why speakest thou unto them in parables? ... 16 But blessed your eyes, for they see: and your ears, for they hear.
Jesus' Disciples Defined
John 8:31-32 Then said Jesus to those Jews which believed on Him,
If ye continue in My word, [then] are ye My disciples indeed;
And ye shall know the truth, and the truth shall make you free.
And Those Who are Not Disciples
John 8:37 I know that ye are Abraham's seed; but ye seek to kill Me, because My word hath no place in you.
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No two things are farther apart than Grace Gospel and Kingdom Gospel.