I believe it's not entirely the environment we find ourselves (like the church) that creates this peace of mind.

Being happy is totally different from being distracted from your heart ache, and that is what most people often experience, a temporal detachment from one's reality.

True calmness of the mind comes when one generates it from within. Composing the mind to function flawlessly, it's the perfect solution, because this time nothing in the actual world controls it, but it's in one's mind that these calmness is formed.