Here we see clearly illustrated that baptism symbolizes the death and removal of the old nature and the rising again with a new nature.
Therefore, if anyone in Christ, a new creation; old things have passed away; behold, all things have become new. 2 Corinthians 5:17 NKJV
It doesn't get any clearer than this. The old has passed away. The old is done away with in Christ. In Him, you are made totally and completely brand new!
Paul also reveals what God made us in Christ when the old was removed.
For He made Him who knew no sin sin for us, that we might become the righteousness of God in Him. 2 Corinthians 5:21 NKJV