Religion and monolithism
Surfing the atheist blogs, I see the same thing. That everytime a theist goes against their pre-rendered schemas, then they aren't following their religion [i.e they are not TRUE Christians/Muslims etc....]
This is of course common with anyone familar with group psychology. That when a member of the outgroup breaks the schema [Oh and for the record, one common thing in group mentality is that the perons sees the outgroup as homgenous and the ingroup as heterogenous] then by golly, they can't possibly be TRUE Christians, they are the exception etc.....
The reason this fails is for several reasons:
1] The person is not always the exception.
For example, it is common thought that if a Christian thinks that embryonic stem cell research is morally acceptable, they are the exception. This, however is not the case
This of course, relies on ancedotes [As nearly all ingroup views of an outgroup do]. "Well, so and is against embryonic stem cells and he's Christian"
[oh and perhaps for another topic, whenever something goes against their veiw, then clearly the people who present it and did the actual research are a bunch of religious apologists.]
Second of all, this assumes that Religion is monolithic. This is not the case. [The same people ironically, say that the Bible is contratictory and vague, what this means is that lots of things can be supported by the Bible.]
Not only does this border on "No True Scotsman", it also dives into the Genetic Fallacy.
Allow me to demostrate:
Early Surgery methods were cruel, painfull and barbaric, therefore any surgeon who uses anesthetics are not following the practice of surgery.
This of course assumes the Surgery is monlithic. That Surgery can't change.
Same problem here.
The fact of the matter is that religion DOES change, and merely dismissing the changes and say "oh, well, they're not following their religion" is, quite frankly, a sympton of group mentality.
Relgion CAN change, and Religion DOES change, and simply re-defining things and playing mental gymnastics isn't going to change that.