According to Romans 14:23 the Christian is capable of being condemned and it is because of sin which is defined as "anything that does not proceed from faith" which Jesus says is "anything that is beyond 'yes, yes' or 'no, no'". No problem for my view.
your mincing words and text to sustain your argument, so this isn't for you its for the reader:
1Jn 1:6 If we say that we have fellowship with him, and walk in darkness, we lie, and do not the truth:
1Jn 1:7 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.
1Jn 1:8 If we say that we have no sin, we deceive ourselves, and the truth is not in us.
1Jn 1:9 If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness.
1Jn 1:10 If we say that we have not sinned, we make him a liar, and his word is not in us.
its absolutely unrealistic to think that people don't make mistakes when they do things no matter how good of a thing they may be doing. its a process that demands a penitent life style. so no if you make mistakes you have need to repent from to sustain a good relationship between you and God you're not condemned into darkness but you do hamper you well being with the Lord.
Paul explains here
1Co 3:11 For other foundation can no man lay than that is laid, which is Jesus Christ.
1Co 3:12 Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble;
1Co 3:13 Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is.
1Co 3:14 If any man's work abide which he hath built thereupon, he shall receive a reward.
1Co 3:15 If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire.
that which is of God remains with God, that which is not returns to the ground.