Hopefully making theology simpler to understand! (2 Corinthians 1:12)

But if we walk in the light, as he is in the light, we have fellowship with one another, and the blood of Jesus his Son cleanses us from all sin.
1 John 1:7, ESV

Salvation is a moment. Both 2000 years ago and the moment you believe.

However, we walk out our salvation for the rest of life, as we follow the Light of Christ and let Him continue to cleanse us.