In this book such ideologies as materialism, communism, Darwinism (the so-called scientific basis of those ideologies) and other systems based on disbelief are referred to as "religions of irreligion." Throughout the 20th century until today the religion of irreligion has, perhaps for the first time in history, spread extensively. That is why, especially in our age, it is of great importance for believers to take part in the noble intellectual struggle mentioned in the Qur’an and save the world from the evils of irreligion.