The research which analysed 139 studies over more than 30 years has linked well-being and religious belief.
It confirmed religion affects a person's happiness and personal satisfaction.
Specifically, the data showed certain aspects of religion, such as participation in social activities, like church groups, and clubs are good for welfare.
Higher levels of involvement in churches also showed a positive impact on mental health.
Generally the research showed that people who were more serious and committed to religion experienced greater levels of well-being.
Religious people were also generally happier than those who had no faith.
Theos' head of research Nick Spencer said: "The evidence linking religion and well-being, and especially religious participation and well-being is now overwhelming.
"It is time we thought carefully and creatively about how we can harness this powerful resource to improve well-being and mental health, rather than running scared from the very idea of religion."
Theos' research was categorised to correlate which aspects of religion are specifically associated with different aspects of well-being to help inform future studies.
Author: Megan Howe
