God will not spare you or excuse one sin

God will not excuse one single disobedience on the judgment day and therefore He will not spare you for one single disobedience ether. He will punish you, and punish you severely because He is a good Father and He wants us to share in His holiness.
If we have become children of God then we must OBEY Him because He will punish us so that we can correct ourselves and that we do not perish in the judgment day. God only has one standard and that is perfect obedience. We read in Hebrews 12:5-8 “MY SON, DO NOT REGARD LIGHTLY THE DISCIPLINE OF THE LORD, NOR FAINT WHEN YOU ARE REPROVED BY HIM; FOR THOSE WHOM THE LORD LOVES HE DISCIPLINES, AND HE SCOURGES EVERY SON WHOM HE RECEIVES.”
Verse 8 “But if you are without discipline, of which all have become partakers, then you are illegitimate children and not sons.”
Verse 10 “He disciplines us for our good, so that we may share His holiness.”
If you have accepted Jesus and become a child of God, then you need to live according to God's standard and that standard is perfect obedience.
May Jesus bless you.