Does only one sin in your entire life disqualify you for the kingdom of God?

While on this earth Jesus lived a sinless life. If you belive on him his perfect righteousness is imputed unto you as if you lived a sinless life. God is a perfectionist. If you have commited even one sin in your entire life, he won't allow you to enter his kingdom. If you have commited even only one sin in your life you will need to believe on Jesus so that his perfect righteousness is imputed unto you and then you can enter the kingdom of God. Is that right?