They already are, look at this accusation of blasphemy.
Of course the accusation is justified and within the narrow bounds of this site’s ‘Rules of Engagement’ it is understandable.

I have had several stabs at challenging some basic doctrine here because I believe Christianity lost its way in the muddle of the very early proto-church. I think the root of Christianity’s inability to maintain levels of standing and respect in the community at large is planted firmly in an over reliance on a theology that boils down to inherited opinion based on always debatable interpretations of an historically challengeable written source. It is these interpretations, philosophised about and debated for centuries that are the source of all current theology. I am very much in a minority of one here and I am confident that I will only acquire any level of evangelical certainty when I meet our maker, and not before even if they do pull out my finger nails.

So if that’s not heresy, what is? I don’t worry too much about it though.