I am not sure how to get this report, a group of American Psychiatrists, Rick Scarnati, Mark A Madray, Alfreda Wise, Henry D Moore Jr, Mark C Schmeider and Matthew L Stephens: Religious Beliefs and Practices Among Most Dangerous Psychiatric Inmates. Forensic Reports Vol 4 pp 1-16 Jan-March 1991.
There does seem to be a link with Religion and Schizophrenia.