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Hi Chester,
Good question.
All sins have been paid for. Unlimited atonement . When we made Jesus the sole Object of our faith, we are saved forever.
Our walk with God thereafter is a separate matter. That's why I John 1:9 was written to believers, not unbelievers. It has to do with fellowship rather than salvation. In the KJV, there's an IF at the beginning of the verse.
I will post a good brief message that explains why we should walk with the Lord after salvation. Keep in mind Psalm 32 and Jeremiah 3:13 KJV when you sin.
Have a great day.