I havent read the whole thread through, but just have a couple of comments on poiunts in your last post.
1) If the parents were non conformists they wouldnt necessarily have the child christened. Unlikely in this case as you have found that the siblings were, but possible that they went through a phase of attending chapel, and that was at the time of George's birth
2) More likely, I think your clue is in the fact that at Sarah's christeneing there is the mention that the child waas born one place, but dad was hired out as a grdener elsewhere at the time. It seems likely that, if this was the nature of dads work, that he could have been hired somewhere other than Kinnerlsey or Shobden at the time of George's chrisitening and therefore it is in a parish other than those two, but probably within the area.
Have you checked all neighbouring parishes?