What's more, even if the chalk magically stayed up in the air or something else miraculous, every time he tried to shatter it, even if it was every single time - that still wouldn't evidence God, because it could just as easily be a super powerful alien doing it as God. It could even be a super powerful alien pretending to be the Christian God. And in fact, this is more likely than God, because aliens evolve, they actually have an explanation - evolution. God is just a big gigantic miracle... God is the ultimate miracle(well he would be if he existed) - he's just 'there' or exists 'outside time' or 'created himself' even, all completely unexplained. It being an alien pretending is actually much more probable than "God".
EvF
EvF