Except some of us consider ourselves to be quite evolved, not religious, AND absent of depression. Maybe depression (or the lack thereof) has nothing to do with religion at all.
If you're trying to establish if X is a cure for Y, then looking at people who don't have Y will not tell you much.
Anti-religion aka the religion of Scienc(TM) is still a religion.
If you're trying to establish if X is a cure for Y, then looking at people who don't have Y will not tell you much.