How can someone “do away with God” if they don't even know Him? The Church does believe He exists, but He is not their God UNTIL He is their God.
Luk 10:21 In that same hour He rejoiced in the Holy Spirit and said, "I praise You, Father, Lord of heaven and earth, because You have hidden these things from the wise and the learned and have revealed them to infants. Yes, Father, because this was Your good pleasure.
Luk 10:22 All things have been entrusted to Me by My Father. No one knows who the Son is except the Father, and who the Father is except the Son, and anyone to whom the Son desires to reveal Him."
If Jesus came into one of these God denying churches to preach today, they probably wouldn't even know it was Him, and they'd throw Him out to boot. Those that did believe Jesus was the Son of God, killed Him.
Atheists ain't got nothing on those that honor Him with only their lips. Since we're doing conspiracy theories right now, here's one. The Church has made more atheists than the atheists themselves.