@Switch Blayde
But I think the sentence is probably used with referring the one and only God holding you which would make it a capital "G".
Again, it was likely "Oh, god!", since the context wasn't related to help, and neither made the slightest relevance to their religious beliefs. Which is why it stumped me.
@ystokes:Normally, but that wasn't a trend in either story, which is why the similarity was so striking, as it didn't feel like a mere typo. Though, given the lack of context, it's also unlikely a reference to any given diety, just a random profanity directed again no one.
@Ernest Bywater:
When referring to a specific deity then a capital is required
Only is it's a proper noun, (i.e. the god's name is literally "God"! If he's part of a plethora of gods, then the curse would specify his actual name.
But again, I wasn't asking about standing conventions, but whether these two usages pointed to something the rest of us can't see, and if so, why? Again, they didn't seem like random typos, so the only thing left is a philological/religous point of view.