For several decades much research has shown that people who often attend religious services estimate their life quality and health higher than people who never attend church. (e g Koenig, McCullough & Larson, 2001, 2012). Much of this research has been done in USA. What about Sweden - one of the most secularized countries in the world? The theories of existential epidemiology and of the importance of existential health to other aspects of health from prof. Valerie DeMarinis were used as a theoretical base in this study. The purpose of this mixed method sequential study was to compare 247 elderly (medium age 75) according to their frequencies of church attendance: Were there any significant correlations between frequency of church attendance and existential health according to WHOQOL-SRPB? Where there any significant correlations between existential health and the other aspects of health assessed in WHOQOL? What factors were mentioned as explanations to existential health among elderly in this secular country? This question was investigated in the second qualitative part of the study where eight interviews were done, four with persons who never attend church and four who often did. The interview persons were matced to demografic variables and to general health according to WHOQOL. Statistical calculations were made with Spearmans rank order correlation and Mann-Withneys U-test for nonparametri variables. The interviews were analyzed both inductively and deductively. The results showed significant correlations on 0,01 level between church attendance and all aspects of existential health in SRPB. The result also showed significant correlations between every aspect of existential health to other aspects of health, most clearly to social and psychological health. The correations were stronger to some of the aspects of existential health. It was also a clear difference in existential health accordning to assessment on SRPB between the two groups. For intrview persons who never attend church the ways to get existential health was for three of them to engage in different activities as physical exercise, music, spending time with relatives and friends. The fourth person, who estimated higher on SRPB, described a number of aspects of existential health. Among those who often attend Sunday service this was not per se a a factor mentioned as an explanation to their high existential health. Instead it was their Christian faith as a whole that made their existential health. Researchers in Psychology of religion in Sweden claim an existential epidemiology spread, especially in groups of young people and immigrants. This study shows rather low existential health also in a group of elderly . A collaboration between health care centers and local priests, deacons, pastors and imams are suggested to prevent and treat low existential health.