I understand we have to walk in the spirit, not in the flesh, but op needed to hear the gospel first.

John 1: 8-9 If we claim to be without sin, we deceive ourselves and the truth is not in us. If we confess our sins, he is faithful and just and will forgive us our sins and purify us from all unrighteousness.

I never claimed to be without sin, I even said all humans are sinners. By believing in the gospel we are confessing that we are sinners and it is asking forgiveness for all our sins, past present and future. Yes we need to live in the spirit not the flesh but having the foundation of Christ is what saves, not our righteous lifestyle, yes follow the spirit and not the flesh and we will receive rewards from God, but the foundation of Christ is what saves us:

1 Corinthians 3: 10-15 By the grace God has given me, I laid a foundation as a wise builder, and someone else is building on it. But each one should build with care. For no one can lay any foundation other than the one already laid, which is Jesus Christ. If anyone builds on this foundation using gold, silver, costly stones, wood, hay or straw,  their work will be shown for what it is, because the Day will bring it to light. It will be revealed with fire, and the fire will test the quality of each person’s work. If what has been built survives, the builder will receive a reward. If it is burned up, the builder will suffer loss but yet will be saved—even though only as one escaping through the flames.