Spirituality and mental health

I heard a report on the BBC Wuhld Suhvice this morning about a study done in England and Wales that indicates that people who are "spiritual," but not "religious" are more prone to mental illness such as depression than either "religious" people or "secular" people. They did  a follow-up study that showed that "spiritual" people who are mentally healthy are more likely to succumb to some kind of mental illness in the following year. I wonder whether one who is spiritual without a religion is more susceptible to the influence of malevolent spiritual forces because they don't have the "protection" that a society with a tradition of spiritual discernment and combat has.