An important debate in new theology, philosophy of religion and ethics is how to evaluate the relationship between religion and morality. Daniel Dennett concerns the problem pessimistically. He has narrated the useful moral functions of religion, declared by the proponents of religion and objected them in several ways. One of the mentioned affairs in this field, is the relation between religion and moral action, in which he persuades religious malfunction. Therefore, the present issue is to study Dennett’s critics on religious function in moral behavior and evaluate it from the viewpoint of Islamic philosophers. The method of research in the context of discovery is library study, and in the context of evaluation id rational-analytical one. The result is that scientific standards do not agree with Dennett’s view, and he has not followed them in the ground. His judgements are objected by composition of several fallacies, lacking appropriate credibility.

Key words: Religion and ethics, moral action, moral patterns, social foundation of morality, Daniel Dennett.