This question is for Americans. Undeniably, despite the vast differences between atheists and agnostics on the one hand and the more exotic brands of Christianity that believe in snake handling and faith healing on the other, don't we have this in common: that we both depend upon respect for the Freedom of Religion guaranteed by The Bill of Rights? And thus shouldn't we step to their defense when the government wants to make an exception and prosecute them for their practices?
Remember, the mainstream religious community views us as pretty much in the same "religious weirdo" bag with the more wacko religious sects.
Any adult should have the ability to involve themselves in any activity they freely choose as long as it does not harm anyone else in the process. This would include suicide and euthanasia.
Denial of medical treatment to a minor is inexcusable on any level.