Note that this study doesn't account for the health damage religious people do to non-religious people. Being a perpetrator is healthier than being a victim.

Not does it account for organized religions ability to forcibly displace other social support (community gathering) organizations. (Social support was the largest factor in improved health among religious people in the study).

Study also excluded, by design, any effects religious services may have on causing cardiovascular problems or cancer, on confounders due to already sick people finding religion.