If we could have a perfect life then we would not need God.
But there is no perfect world created until Christ second coming.
But once we get to heaven we shall have a perfect one without sin.
Sin is the disease  that is keeping us from having one now.
For we all need the Christ no matter who we might be or know.
Adam and Eve became disobedient to our Savior in the garden of Eden.
So Christ had to come down to the earth to die a sinners death.
To bring us back into the fold that Adam and Eve separated us from God.