"Whenever you hear scientists categorically state that something does not exist because we have no evidence for it, alarm bells should start ringing immediately."

Dawkins does not categorically(being without exception or qualification; absolute) state that God does not exist. Dawkins uses the word "probably". So your assertion about Dawkins is untrue, a straw man.By the way You might just READ Dawkins book before you start ranting, as it will ensure that you don't make yourself look like an ass.