The new creation is a concept found in the New Testament, related to the new life and new man but with reference also to the Genesis creation narrative.

Has it become a new creation?

Therefore, if anyone is in Christ, he is a new creation; the old has gone, the new has come! that God was reconciling the world to himself in Christ, not counting men's sins against them. ... We are therefore Christ's ambassadors, as though God were making his appeal through us.

What does it mean to be a new creation in the Bible?

This “new creation” that you become is now a cherished son or daughter of God. This means you are no longer dominated by your sinful nature, but are now controlled by the Holy Spirit because you have the Spirit of the Living God dwelling on the inside of you.