From the article:

“Finally, it could also be that religious activity is associated with greater well-being simply because happier, healthier people have more inclination and ability to be active in their communities, including religious groups. People who are unhappy and struggling physically or financially generally may be more isolated and less able to engage in social activities.”

I lean toward thinking that this is the main reason for the findings. Sitting in church is not the CAUSE, for health, happiness, etc., but there is a correlation.

What I think is that deep awareness and appreciation for the magnificent reality that we experience gives us courage, joy, health, and motivation to live well. There is probably more of that kind of awareness among religious people, but they don’t hold exclusive rights to that attitude. A good many people who call themselves atheists are also deeply aware. There are those with a sullen, argumentive frame of mind in both camps.

Ignorance is bliss