How does pushing God out of their thinking lead people into an immoral lifestyle?

Les explains that in verse 24, because people push God out of their thinking, they begin to worship anything and everything but the one true God, and as a result they open themselves up to the immoral lifestyle. He also cites a secular article arguing that unless a society is guided and controlled by religious values, it cannot last, because even an imperfect religion provides guidelines that keep people within a spectrum of behavior. Without such restraint, society falls into anarchy and no restraint. Les uses Rome as an example: its great military could not save it because the city became politically, economically, and morally corrupt, and it defeated itself. Historians warn America is going down the same road and will destroy itself from within.