Wrong! If you actually read the Bible, you would know John in his epistle was Addressing Christians! Here's the verses preceding Nehemiah's verses!
"This is the message we have heard from him and declare to you: God is light; in him there is no darkness at all. 6 If we claim to have fellowship with him and yet walk in the darkness, we lie and do not live out the truth. 7 But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus, his Son, purifies us from all sin." 1 John 1:5-7
His 2nd and 3rd epistles clearly lay out that he is talking to Christians in churches! He addresses " the elder" In the first line of both.
See how you have messed up not reading the Bible? You are clueless about the message, the details, which means you can't be following God.
If you got bored with the Bible are you really a Christian at all?
"They went out from us, but they did not really belong to us. For if they had belonged to us, they would have remained with us; but their going showed that none of them belonged to us." 1 John 2:19
Nothing worse than a know-it-all who can't even remember what the Bible says, from his neglect of Study of he Word. God teaches me daily. He used it to transform me.
"Do not conform to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s will is—his good, pleasing and perfect will." Romans 12:2
How do you renew your mind, without reading the Bible? You can't!
And the word for "be transformed is μεταμορφοῦσθε or metamorphousthe. It is a verb that is imperative passive. It means God commands us to let him transform our minds through the Word. It is also called the "divine passive." You are directly disobeying a NT command of God by not reading the Bible.
And of course:
"Every scripture is inspired by God and useful for teaching, for reproof, for correction, and for training in righteousness, 17 that the person dedicated to God may be capable. and equipped for every good work." 2 Tim 3:16-17
You must not be dedicated to God!!
I see this 1 John chapter 1 and 2 as we are either walking in our old dead nature if we are into sin. Or we are walking in the spirit if we are not into sin.
Chapter 1
6 "If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:"
6. Not in him because we are either not saved or have not put on the new man.
7 "But if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus Christ his Son cleanseth us from all sin."
7. In him because we are saved and have put on the new man.
8 "If we say that we have no sin, we deceive ourselves, and the truth is not in us."
8. Not in him because we are either not saved or have not put on the new man.
9 "If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."
9. In him because we are saved and have put on the new man.
10 "If we say that we have not sinned, we make him a liar, and his word is not in us."
10. Not in him because we are either not saved or have not put on the new man.
Chapter 2
1 "My little children, these things write I unto you, that ye sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous:"
1. Not in him because we are either not saved or have not put on the new man.
2 "And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world."
2. Not in him because we are either not saved or have not put on the new man.
3 "And hereby we do know that we know him, if we keep his commandments."
3. In him because we are saved and have put on the new man.
4 "He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him."
4. Not in him because we are either not saved or have not put on the new man.
5 "But whoso keepeth his word, in him verily is the love of God perfected: hereby know we that we are in him."
5. In him because we are saved and have put on the new man.
6 "He that saith he abideth in him ought himself also so to walk, even as he walked."
6. In him because we are saved and have put on the new man.
The last verse I'm going to mention has "in him" again. From 1 John we read "that he was manifested to take away our sins; and in him is no sin." We cannot sin in him because there's no sin in him and this is why "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."