Yes you atheists have been deceived, you have bought into the myth of secularism eagerly abetted by pseudo science which ever seeks to show that man can define his own morality. The God haters believed in this lie in order to excuse their many sins of adultery, fornication, murder, abortion, racism, sexism, selfishness, idolatry the list is endless. All blinded by their sins and the chief sinner of them all - the devil. The sad thing is that the eternal damnation promised for these sinners is very real.
As the Bible says
The god of this age has blinded the minds of unbelievers, so that they cannot see the light of the gospel of the glory of Christ, who is the image of God.
2 Corinthians 4:4