In fact...
In fact, we realize that moderate eating, sleeping, and playing generate energy to do more work. Similarly worshipping Allah subhanu taala increases our potential to do more scientific work. A person who sincerely worships Allah(swt) with understanding will never waste his time in watching useless films, listening music, gambling in casinos or any other hopeless thing. People waste their tremendous amount of energy and time in doing the things which are prohibited in Islam.
Thus, by following the teachings of the true religion we not only save our precious time and energy but also use them for constructive work. The fourth argument is also not correct. The true religion makes our life full of pleasure. Many chronic diseases such as AIDS, cancer, and heart problems are making human life miserable. No one can enjoy life with fear that he can be the next victim of any of these killing diseases. But the true followers of the true religion have no fear.
They know that life in this world is temporary and ultimately they have to leave this world for another permanent world. Thus, for a purposeful and prosperous life religion is essential. However, the choice of a wrong religion can destroy the life here and here-after. Finally, we can prove that religion is necessary by analyzing ourselves. We have a natural instinct to know about ourselves. We can feel this urge in times when we are free of external pressures.
For instance, it has been observed in many cases of serious car accidents, that when the unconscious person recovers, he instantly asks many questions to the people standing around him. He asks; where I am ? How I came here ? Who brought me here ? What has happened to me ? Am I safe ? All such questions clearly show that man has a natural instinct to know: from where he has come and where he has to go finally. The true religion has the correct answers to these questions.
If anyone is ignoring these questions then it means that he is insensible. This is what Ammr-ul-momineen Hazrat Ali (as) said in one of his sermons ; " People are sleeping, they will awake after their death." The true religion tells us many things which we can never know from any other source. For instance, Islam gives us correct answers of the following difficult questions : Who has created the universe ? Who has created the millions of types of living species ?