A study of more than five thousand African Americans found that individuals who were involved with or participated in religious activities had significantly lower blood pressure than those who were not, despite being more likely to be classified as hypertensive, having higher levels of body mass index (BMI), and lower levels of medication adherence:
The findings, presented today in New York City at the 21st Annual Scientific Meeting of the American Society of Hypertension (ASH 2006), are from the Jackson Heart Study, the largest exclusively African American study sample ever used to ascertain associations among religion, spirituality and blood pressure.Read more...Female gender, lower socioeconomic status, increasing age, and lower levels of cortisol were associated with more religious activities. Higher levels of religious participation were related to higher levels of body mass index (BMI) and lower levels of medication adherence. Contrary to the original hypotheses, those with more religious activities and participation were more likely to be classified as hypertensive. However, those with more religious activities had significantly lower diastolic blood pressure in an uncontrolled model, and significantly lower systolic blood pressure in a controlled model.
While interesting, this isn't exactly "new" news - a study by Duke University researchers way back in 1998 found that "older people" with an active faith have lower blood pressure:

