I guess religion could make some happier because it fosters community. The problem is that you need to be part of the religion to belong to the community, so basically they are keeping you by exploiting your need to belong, your vulnerability when being alone.

For many people, quitting their religion means they won't be able to interact with their own family in the same way. Because many cults will tell their followers to turn their back on family that rejects the religion.

That's why someone who is away from the religion is not necessarily suffering from lack of order or lack or god, they are suffering lack of people, marginalization.