http://archfami.ama-assn.org/cgi/con...stract/7/2/118

http://www.leaonline.com/doi/abs/10....7965PLI1303_04

http://www.jonmd.com/pt/re/jnmd/abst...856145!8091!-1

http://scholar.google.com/scholar?hl=en&lr=&q=cacheJcLhaM6rdYJ:arapaho.nsuok.edu/~celaya/spirit.pdf+relationship+between+religious+belief+and+health

http://links.jstor.org/sici?sici=007...M>2.0.CO%3B2-H

To answer your question about psychology and psychiatry research as opposed to religious research; the psychs have no religious agenda to prove while religious research does.
PS. there are many more where this came from. I did not post here to get into an argument. The relationship between faith and health is well studied, and the majority in the field agree that it is beneficial.