"When God looks at you, He only sees Jesus. He doesn't see your sins or imperfections." ~ popular saying among Christians
I cringe a bit when I hear this statement. It's not found in Scripture.
When we become Christians, we're forgiven of every sin because of Christ's death, but God still sees our sins and weaknesses as well as our strengths.
Salvation doesn't make us perfect and it doesn't make us a Jesus impersonator.
It allows Jesus to begin changing us from the inside out....because we need to be changed.
If someone tells us we're great just the way we are, we have no reason to change.
God never does this. Because He loves us, He has huge expectations for our transformation (Matthew 10:38; Romans 12:1-2; Philippians 2:12-13; Ephesians 5).
In fact, God disciplines us because He loves us and uses hardships to help us grow in righteousness (Hebrews 12).
That's the kind of God we have and the kind we need!
See also: Does God "forget" our Sins?