A problem with the word "atheist"

[RoadRunner79]

There's just one problem, you can't say for certain that God doesn't exist so if in fact God does exist the you become the epitome of a "dumbf*ck".

It's more like you can't prove that Santa doesn't exist and since belief in Santa smacks of the same sort of superstitious nonsense you can claim god too as no longer credible.

There is a cumulative case to be made for Santa's non-existence. You reason that if Santa did exist then it would be rational for you to expect a lot of evidence to turn up that in fact never has turned up. If Santa exists then it generates a whole lot of reasonable expectations all of which are unfulfilled, like that he would leave sooty footprints as he made his way from the chimney to your bedside; that someone would have actually seen him careering across the sky behind his reindeer fast enough to visit, and spend a little time with, every child in the world in the space of a single evening; you would expect someone to be able to give you a plausible account of how he could break the laws of physics in this way. And so on.

These kinds of evidential considerations, atheists regard, are much more powerful than any to do with simple lack of evidence.

Unless you are going to make a connection between these arguments and the two subjects.... this seems like a very poor bait and switch attempt.  You can't just make a number of unrelated arguments for one thing, and the supersede them onto another without reason.