I personally have witnessed some religious people (to my experience, mostly Christians) who take so serious their faith (i.e. to the extreme) go far and look as crazy ones. There are may be various reasons. From scientific/psychological professionalism, clearly with evidences, to what extent of psychological problems can a religious extremist go/reach?
You might want to add some standard terms to your search: Psychology of Religion, fundamentalism, fanaticism
Several organizations study the psychology of religion and publish journals.
The Society for the Scientific Study of Religion at http://sssreligion.org/
The Society for the Psychology of Religion and Spirituality at http://www.apa.org/about/division/div36.aspx
The Religious Research Association at http://www.rraweb.org/
The American Academy of Religion at https://www.aarweb.org/
You can look at some tables of contents online. Also check out some textbooks on psychology of religion. A number of important texts are listed at http://www.oxfordbibliographies.com/view/document/obo-9780199828340/obo-9780199828340-0066.xml
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