The conscience of the belief in an eternal life has a double effect on human behavior: it might urge the man to act for getting a better place in the future life or to make the man to delay his actions, because of the presumable great amount of time in the future.
But the same effect could be produced by the conscience of a limited life, too. We might act eagerly for not loosing our limited time. And it is also possible to delay our actions for the reason that they are ultimately useless since the human limited existence cannot substantially change the course of events.
The similarity diminishes the supposed strong difference between the behavior of religious and non-religious men. In fact, they are not different in many contexts of life. The same similarity also reveals that the human behavior does not really depend on the beliefs in the eternity or temporary nature of life.
Apart from such beliefs, there is the behavior itself. Its development can acquire to someone different motivations to act which are stronger than the above mentioned beliefs.
The beliefs in the nature of life are often replaced by the real approaches of life. There are bad and good approaches, according to our failure or success in living the particular situations in which we are involved. Again, the good and bad approaches can equally lead to any of the two beliefs concerning the nature of life.
Nonetheless, the men can felt themselves tired of approaching life. And this tiresomeness implies a strong attachment to beliefs, which are all manners to escape from the necessity of living effectively. When a man strongly defends the belief in an eternal life, we may deduce that he really disbelieves the life as such. In his active or inactive behavior, it could be discovered a discontent with the human life. Even the approach of others as brothers betrays the tiresomeness of treating them as individual persons, as it is required for a better approach of social life.
On the other side, the belief in the limited character of life cannot be as strong as its contrary belief. Because there is not presupposed any strong reality as a divine realm behind it. As a consequence, since the non-religious belief is weakly defended, it allows a better approach of life, even when it leads to an inactive behavior. It also expresses the individual’s content with his life, even when it takes the form of denying the value of life, since it does not go as far as to wish for a supposed better future life.