Religion has been the most important factor affecting people's lives since ancient times. Even when people acquire a new identity, the influence of religion plays a role. The fact that religion surrounds human life in many ways manifests itself at almost every moment of a person's life. We can witness this in the theories given about religion. At the same time, religion also has a big role in mental health. In our article, various factors affecting mental health such as mental health, stress, depression, hopelessness are described. At the same time, the question of what religion is was also tried to be answered. After these statements, issues such as religion-mental health, religion-depression, religion-hopelessness, religion-loneliness were touched upon separately. The influence of religion on these feelings has been discussed. Psychologists have obtained different results about the relationship of these emotions with religion. In the article, we touched on the positive aspect of the possible impact of religion on mental health. The results obtained by the majority of psychologists investigating these issues are positive.In the article, the positive aspects are mentioned by referring to the factor that has an important impact on eliminating the psychological difficulties that surround the lives of many people today.