What is light? A brief definition is the absence of darkness.  Of course this is spiritual not physical.  The verse in question says that God is light and in Him is no darkness at all.  So as much as we have of God that is how much light we have. There is a big two letter word “if” and notice it is if we say we have fellowship with Him and walk in darkness we lie.  It is easy to say something but it may not be real in our life.  I always like to emphasize the word “but”. This is always a contrast if we walk in the light as He is in the light we have fellowship with other believers who are walking in the light.  Walking in darkness breaks fellowship and sinful living is devastating to a church.
I am not sure the extent someone goes to say they have no sin.  I could be careful of such a Christian.  They could be blind to their sin as 2 Peter 1 points out.
Now the last point is confession to God when we know we have sinned.  God will forgive.

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