Romans 8 :12-15 Therefore, brothers, we have an obligation—but it is not to the sinful nature, to live according to it. or if you live according to the sinful nature, you will die; but if by the Spirit you put to death the misdeeds of the body, you will live, because those who are led by the Spirit of God are sons/daughters of God.
An Atheist claims God does not exist, God calls Him a fool meaning Eternally but only He knows their heart we don’t, we must never judge a persons Eternal Destiny, they may repent on their deathbed from good seeds that were planted, some who call themselves Atheists are deceived like I was for nearly 30 years. Psalm 14:1 The fool hath said in his heart, There is no God. They are corrupt, they have done abominable works, there is none that doeth good.