Mental Health and Quality of Life Among Adults With Single, Multiple, and No Religious Affiliations.

Few studies have investigated the "multiple religious affiliations" phenomenon. This study aims to understand those with "multiple religious affiliations," describing its prevalence and investigating if there are differences in mental health and quality of life between this group and those with a single religious affiliation and those with no religious affiliation. A total of 1169 adults were included, and 58% had a single religious affiliation, 27.7% had multiple religious affiliations, and 12.3% had no religious affiliation. Participants with a single religious affiliation presented better mental health and quality of life than those with multiple or no religious affiliations. Although most outcomes were similar between multiple and no religious affiliations, happiness and optimism were higher in the multiple religious group, and anxiety was lower in the no religious group. Health care professionals should be aware of the secondary religious affiliations of their patients to identify possible conflicts and to treat them comprehensively.