The article mentioned that people who are more social tend to be more happy. Many religious groups are very socially active. If one is a loner, who has a hard time making new friends, the right religious group is just the ticket. (I'm an atheist myself, so I can't play :P)

But I've noticed that some of the churches around me, in addition to bible study classes, maintain a a very active social calendar for all ages. These churches get it. You are getting people involved, making friends, and keeping the group all together to hinder outside influences from evil people like me.

So, in summary, I think religion can make a person more happy.