The mission of Jesus Christ was not just to save people from their sins, but also to create for God a holy people. People who lived the life of Jesus, who experienced true fellowship, and worshipped God in spirit and in truth.
The reason for this is to participate with God in restoring creation. It is easy to recognize that things are not what they should be, and God desires all those who follow Jesus to participate in the restoration of creation.
Through the resurrection of Jesus we have the hope of things being made new. That includes us! Remember what the apostle Paul wrote:
What this means is that those who become Christians become new persons. They are not the same anymore, for the old life is gone. A new life has begun! (2 Corinthians 5:17; NLT).Becoming new creations isn't something that is reserved for the distant future, but it is meant to be a present reality.
This reality begins the moment we choose to follow Jesus. The problem is, and the reason we don't feel new, is because we still live in a broken, fallen, and sinful world. Our flesh is still drawn to the things of this world, even as our hearts begin to desire the realities of heaven.
See more at Paul's Ponderings: Living as New Creations.