Power of the State vs. Religious Beliefs

In the past week, numerous stories dealing with the conflict between the rule of law - the power of the state - and people's religious beliefs have been reported. This kind of thing is not new. And, this week probably will not be the last time such news makes news.

-- In Minnesota a 13 year old boy is refusing chemotherapy, which medical experts believe will effect a cure for him, and desires to follow a more "traditional", non-scientific based healing regimen based on his family's religious beliefs; the family follows the teachings of the Nemenhah Band.
-- In Wisconsin, a mother is on trial for reckless homicide because she refused diabetes treatment for her daughter and chose instead to rely on prayer; she is following the teachings of the Unleavened Bread Ministries.
-- In West Virginia, a mother is challenging the school immunization law calling it a sacrilege; she descsribes her belief system as "Bapticostal," a combination of Baptist and Pentecostal teachings.
-- In Nigeria, a religious leader is on trial for killing 110 children in attempting to exorcise them of witchcraft.

Should people be allowed the right to follow their religious beliefs without any intervention of the state? If so, does anything done in the name of some religion go? If not, at what point do the interests of the state trump the religious beliefs of a person and who determines when that should occur?

It seems more obvious when a person's religious beliefs causes the death of someone else, but, what would happen if a religious leader calls for the overthrow of the government because of his religious beliefs? Or calls for sexual intercourse with 12 year olds? Or calls for the establishment of 'group marriages' instead of the traditional view?

Where do you weigh in on this issue?