Hello sister (@soggykitten), do you believe that we truly become sinless once we become Christians (by which I mean that we no longer commit even the most trivial of peccadilloes or foibles on this side of the grave) 
If so, what need have we any longer for God's forgiveness, cleansing and restoration as Christians, or for the Lord Jesus to be our Advocate before His Father in Heaven
I believe that the Bible tells us something else, so (for instance) please take note of what the Apostle John has to say in the passage below ... and to whom he is saying it (and please take special note of the fact that, along with addressing Christians of every level of maturity in the faith, the Apostle includes himself as well, by the use of various pronouns such as "we", "us", "our", etc., as someone who may still sin & therefore, may still need to seek the Lord's forgiveness whenever he does).
1 John 1
8 If we say that we have no sin, we are deceiving ourselves and the truth is not in us.
9 If we confess our sins, He is faithful and righteous to forgive us our sins and to cleanse us from all unrighteousness.
10 If we say that we have not sinned, we make Him a liar and His word is not in us.
1 John 2
1 My little children, I am writing these things to you so that you may not sin. But if anyone does sin, 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 those of the whole world.
3 By this we know that we have come to know Him, if we keep His commandments.
4 The one who says, “I have come to know Him,” and does not keep His commandments, is a liar, and the truth is not in him;
5 but whoever keeps His word, in him the love of God has truly been perfected. By this we know that we are in Him:
6 the one who says he abides in Him ought himself to walk in the same manner as He walked.
7 Beloved, I am not writing a new commandment to you, but an old commandment which you have had from the beginning; the old commandment is the word which you have heard.
8 On the other hand, I am writing a new commandment to you, which is true in Him and in you, because the darkness is passing away and the true Light is already shining.
9 The one who says he is in the Light and yet hates his brother is in the darkness until now.
10 The one who loves his brother abides in the Light and there is no cause for stumbling in him.
11 But the one who hates his brother is in the darkness and walks in the darkness, and does not know where he is going because the darkness has blinded his eyes.
12 I am writing to you, little children, because your sins have been forgiven you for His name’s sake.
13 I am writing to you, fathers, because you know Him who has been from the beginning. I am writing to you, young men, because you have overcome the evil one. I have written to you, children, because you know the Father.
14 I have written to you, fathers, because you know Him who has been from the beginning. I have written to you, young men, because you are strong, and the word of God abides in you, and you have overcome the evil one.
Thanks
~Deut
p.s. - for clarity's sake, I believe that true Christians can and do sin, but I do not believe that we make a "practice" of doing so (IOW, we do not live in sin/live an unrepentant, sinful lifestyle, like we used to do before we became believers). I also believe that we do NOT lose our salvation when we sin, but our relationship with God certainly suffers until we ask Him to forgive us, and He cleanses us and restores us to full fellowship with Him.
1 John 3
9 No one born of God makes a ~practice~ of sinning, for God’s seed abides in him; and he cannot keep on sinning, because he has been born of God.
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