Hunsberger and Brown 1984, atran 2004
That is incomplete information. Seriously, can you at least cite the name of the study or article that you're allegedly cherry-picking your info?
Here's a study:
"Who benefits from religion?"
http://www.people.hbs.edu/mnorton/mochon%20norton%20ariely%202011.pdf
That study cites "Hunsberger & Brown" in its references, a book/article titled "Journal for the Scientific Study of Religion". That lead to the next internet search, which turned up this:
Chapter 12
Religion and Mental Disorder
Religion as a Hazard to Mental Health
http://softdevlabs.com/personal/psych/disorder.html
Research Box 12.7.
Rigid Religiosity and Mental Health
(Stifoss-Hansen, 1994)
"Religious bodies possess rules and regulations that people can often interpret in ways ranging from an easy flexibility to a rigid absolutism. The latter has been defined in one major study as a "law-orientation." a In the present study, a scale of rigid-flexible religiosity was developed and administered to 56 volunteer hospitalized neurotic patients and a control group of 70 nonpatients. The first group scored significantly higher than the controls on the scale, demonstrating that a rigid religiosity is a correlate of, at least, severely neurotic thinking and behavior. The author is inclined to suggest a positive relationship between mental disturbance and an extrinsic religious orientation. "
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a Strommen, Brekke, Underwager, and Johnson (1972).
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That is one studys findings. It does not state that religion attracts people with mental illness, just that participating in rigid religiosity "demonstrating that a rigid religiosity is a correlate of, at least, severely neurotic thinking and behavior.".
Nothing in that study supports your claim that higher number of religious recruits are already mentally ill ("diseased") before they join, or that "new" religions (don't Jehovah's Witnesses claim to be Christians?) automatically attracts high numbers of mentally "diseased" persons.
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In the case of law (which was not talked about by me prior to this), it goes back to whether or not the clergy in that particular church are qualified to diagnose such a thing and if those were the actual reasons why the person left the church.
Leaving the church is a human right. The watchtower cannot claim human rights for itself as an organizational whole, and then deny individuals their basic human rights by punishing those who leave.
THE UNIVERSAL DECLARATION OF HUMAN RIGHTS
http://www.un.org/en/documents/udhr/
Article 18.
• Everyone has the right to freedom of thought, conscience and religion; this right includes freedom to change his religion or belief, and freedom, either alone or in community with others and in public or private, to manifest his religion or belief in teaching, practice, worship and observance.
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In fact, the watchtower signed an agreement with a country, in order to carry on their preaching work:they would not disfellowship people who accepted blood transfusions. So what did watchtower do to punish people for violating their man-made rule? If the person accepted blood transfusions, they would be counted as disassociating themselves, which is the exact same thing as disfellowshipping.
"Bulgaria, the Watchtower and Blood Transfusions"
http://www.jwfacts.com/watchtower/bulgaria-blood-transfusions.php