Let the Word of God define atheism for you: in Ephesians 2:12 we have the Greek word atheos translated in English without God, easy peasy. And once you are born again or born of God you are no longer without God but with God by being in Union with Jesus Christ the second Adam

 The reason most Christians are not witnessing or being a good witness for their Lord and His Kingdom is because they're still living out of the old man and not out of the new man, easy peasy

 If you don't read the Bible for yourself you'll get your satisfactory answer once you're in the Lake of Fire because only then you will understand the true nature of sin and the consequences

 The Lord told me years ago truth trumps love, God is love that's for sure and God so loved the world but God's word is truth, Jesus is the truth, the holy spirit is a spirit of Truth, the church is to be the Pillar of Truth, the truth will make you free once you know the truth, just for starters

 The word of God says the fool says in his heart there is no God and then the Apostle Paul wrote the message of the Cross is foolishness to those who are perishing, and don't forget the word atheist comes from the word atheos which is found in Ephesians 2:12 translated in English without God and also the word of God says that the god of this world the devil blinds the mind of unbelievers

 Besides the Holy Bible there are no other Holy books but only Unholy books, you need to understand the true sense of the word Holy

 as long as there are people that are Born of the Spirit the Holy Spirit is there no matter what but what we need is the Holy Spirit being Lord over that local Church