Hitler saved Britain by various means. A) After the defeat of France he ordered research into expensive new projects like the ME262 be ceased. B) He ordered advancement in bomber development (such as the Condor) be ceased. C) he genuinely wanted to spare Britain as he saw them as a future ally against communism.
Hitler and Churchill were both genocidal monsters (no arguments that Hitler was worse). The Victor got to write his own epitaph unsurprisingly.