God as a Matter of Course
Pascal (1623-62) presented a theory to encourage belief in God:
Pascal argues that a rational person should live as though God exists and seek to believe in God. If God does actually exist, such a person will have only a finite loss (some pleasures, luxury, etc.), whereas they stand to receive infinite gains (as represented by eternity in Heaven) and avoid infinite losses (eternity in Hell).https://en.wikipedia.org/wiki/Pascal%27s_Wager
However Satan is stronger in persuading people to forget about God, since there is no need to believe in God in order to acquire wealth and realize material happiness in this world. And, material happiness is real as it can be seen, while God is not real as people cannot see Him. Satan teaches people not to respect what cannot be real in this world.
However, can anybody want all the others to stop believing in God? Then only liars, thieves, murders, swindlers, violent guys, and all the other criminals occupy this world, since justice and righteousness cannot be possible without belief in God.
If you don't believe in God and everybody doesn't believe in God, there will be no absolute authority that encourages justice and righteousness among people. And without justice and righteousness supported by absolute authority, this world would be controlled only by evil and bad guys. Then, there would be no survival and progress of the human society.
Modern wealth is produced by modern technology that is based on modern science. People have no doubt about validity of various theories of modern science such as electromagnetism that has helped development of electric engineering. But who created electromagnetism from the beginning? Did it happen to be created in the universe by chance? Or doesn't our intelligence tell that it was created by some highly intellectual existence such as God?
Put simply, if a man doesn't believe in God while knowing a possibility of existence of God, he will surely go insane or mad finally, since he has no absolute authority to respect as a matter of course.
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Mat 6:16 Moreover when ye fast, be not, as the hypocrites, of a sad countenance: for they disfigure their faces, that they may appear unto men to fast. Verily I say unto you, They have their reward.