People who do not submit to the religion that Allah has sent for mankind do not have the good manners described in the Qur'an and do not preserve the limits stated in the Qur'an. Since they do not fear Allah and do not believe in the Hereafter, they are not affected by the fear of being judged for what they do. For that reason, societies without Islamic morals are full of individuals who perform all kinds of immoralities and evil without any fear and without thinking of the consequences. A rapid and extensive process of degeneration is inevitable for such societies.
This social decline can be seen in the ease and frequency with which people commit robbery, cause damage to other people, lose their temper, kill people, violate the rights of others, lie, never appreciate anyone other than themselves, never do anything except in return for material benefit, and always oppress those who are weaker than themselves. A person who says, "I may not be religious, but I am not a violent person either" may one day find himself in a situation that he can no longer endure, and claim to have the right to do all kinds of wrong actions. He may get so angry that he may even attempt to kill someone.
Irreligiousness, since it does not accept any limits, destroys all humane feelings in society and leads to a terrible degeneration. In irreligious societies, the justice, humility, good manners, compassion and affection that religion brings to mankind never exist. Therefore, lack of Islamic morals is the main source of a community's moral and social declines.