Not surprising. This is taught in the majority of churches. Hence it is the wide gate path. Verses like these are taken out of context to justify that one can sin and still be saved and not so as to live a holy life. Take for example 2 Corinthians that you quote from.
In 2 Corinthians 13:5 (KJB) says,
“Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates?”
Also, you quote from the 1st epistle of John. Yet, his epistle also says this:
“He that saith, I know him, and keepeth not his commandments, is a liar, and the truth is not in him.”
(1 John 2:4) (KJB).
What truth is not in them if they do not keep His commandments?
Jesus. For Jesus is the way the truth, and the life (John 14:6).
If they do not have Jesus, then they do not have life. For he that has the Son has life, and he that does not have the Son, does not have life (1 John 5:12).
“In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.” (1 John 3:10) (KJB).
1 John 2:3, 3:23 & 5:3 commandments parsed
People often add there own contextual application to 1 Jn 2:3 & 1 Jn 5:3. IE the 10 commandments.
Originally scripture wasn't written via chapter & verse. That's added later by translators. Taking one verse out of context invariably leads to doctrinal misinterpretations.
1 John 2:3 And hereby we do know that we know him, if we keep his commandments.
(NOTE: For John's intended reference to keep his commandments. You must READ ON!)
1 John 3:23 And this is his commandment, That we should believe on the name of his Son Jesus Christ, and love one another, as he gave us commandment.
(NOTE: What commandment is 1 Jn 2 referring to? Everyone who believes in Christ & loves his brother is born of God. Also see what Jesus say's in Matt 22:36-40)
1 John 5:
3 For this is the love of God, that we keep his commandments: and his commandments are not grievous.
4 For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith.
5 Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?
(NOTE: How does someone overcome the sins of the world? Vs 2: via FAITH! Faith in what? Vs 3:That Jesus the Son of God, the promised Messiah!)
What are the greatest law commandments?
Matt: 22:
36 Master, which is the great commandment in the law?
37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
38 This is the first and great commandment.
(NOTE: # 1 Love God)
39 And the second is like unto it, Thou shalt love thy neighbour as thyself.
40 On these two commandments hang all the law and the prophets.
(NOTE: #2 Love your brother. Does Jesus mention any of the Mosaic 10? NOPE!)
Romans 13:
8 Owe no man any thing, but to love one another: for he that loveth another hath fulfilled the law.
(NOTE: Love fulfills the law)
9 For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbor as thyself.
(NOTE: If you truly Love someone. You won't kill, steal from, bear false witness against, covet their stuff, etc)
10 Love worketh no ill to his neighbor: therefore love is the fulfilling of the law.
(NOTE: If you truly Love someone. You won't kill, steal from, bear false witness against, covet their stuff etc)
Gal 6:2 Bear ye one another's burdens, and so fulfil the law of Christ.
NOTE: Loving your brother fulfills the law of Christ)
What's the commandments of Christ? The same person (Christ) that wrote the Mosaic 10 commandments. Give's a new superceding commandment: Love your God 1st & your brother.
John 13:
34 A new commandment I give unto you, That ye love one another; as I have loved you, that ye also love one another.
(NOTE: What's the commandment/law of Christ? Love your brother)
35 By this shall all men know that ye are my disciples, if ye have love one to another.
(NOTE: Love your brother)
James 2:8 If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbor as thyself, ye do well:
(NOTE: Love your brother)
The apostles had disagreements & still managed to love one another. Many opinions are shared on these public discussion forums. You & I disagree, no harm, no foul. Peace