I think that what he is asking is, why couldn't Big Foot and Yeti exist undetected?
I'll guess...because they are believed to be animals living on earth and subject to the same natural laws as anything else on earth? That would be true of what most believers think they are, but would not necessarily hold true with a god.
On the other hand, I guess that's more about liklihood of existing and, in that case, gods seem a lot less likely than undiscovered mammals.
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