Believers and Unbelievers
To think that God always watches himself or herself is a basic notion for a believer.
As God is almighty, He must be able to observe and record every moment around any man. God must keep such records somewhere. Even what a man thinks and feels must be also recorded in archives of God. Accordingly God judges everyone in a fair manner.
To believe existence of God means to accept teachings of God. It is to regard teachings of God as absolute laws and rules on which a man is judged.
Conversely, if one doesn't accept such absolute codes, everything in this world would look like just having a relative value. There is no absolute justice and no absolute evil, they would think. Therefore, at any moment, they would commit a harmful act or engage in immoral behaviors.
But if you admit that God is the only absolute source and bases for value and morals, you might try to meet the absolute codes as much as possible in any moment.
The gap between a believer and an unbeliever is so large, since one is to enter Heaven and be given eternal life while another goes down to the hell to be lost.
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Luk 12:6 Are not five sparrows sold for two farthings, and not one of them is forgotten before God?