It rather depends on what one calls evidence. This, in turn, depends on what taxonomical class we place 'God' and 'Bigfoot'. It's axiomatic that God is in a class of its own, and if such a being exists, it is not subject to empirical determination. The classic 'Five Ways' are an argument for the existence of God. Bigfoot, on the other hand, will fall within a taxonomic class in which one can safely assume that an empirical trace must be found if we are to assume Bigfoot exists. As there is none, then it is safe to assume that Bigfoot does not exist.