Practical Atheism

We have been justified by faith. That is we are declared righteous in the court of heaven and not by any thing that we have done. And we have been given Christ righteousness as our completed righteousness. We cannot do anything else to make this standing that we have as completely righteous, since we did not earn it in the first place. It was imputed to our account. And imputation is by grace. But we still are corrupted in every part. We still have the remnants of sin. We still have the tendencies to stray from our original position in being righteous in Christ. So we still can act like an atheist. Because every sin is an unbelief in His finished work. If we believed perfectly then we would not sin.
We can even act the part of a fool even tho we could never be a fool since we are united with Christ. So that since our position of being in Christ is by grace, then our sins are covered by Christ, even the times when we stray and sin greatly. And since our new life is by being identified with Christ, then we are given the power to persevere by being under His authority. We are so closely related to Him in His death and resurrection by that identity, that we no longer fear punishment for our sins as those who have no hope. So that His name and authority protects us from thinking that we could ever stand in our sins as condemned even tho we are practical atheist.