You're talking about Hawking.
What he's spurting is his own opinion.
I'm not saying that atheists who are scientists don't have their own opinions. I'm saying that no scientist will employ the scientific method, through experimental design, to disprove God. That's because it's impossible. (It's impossible because a person can not design an experiment in which the existence of God can be proven or disproven.)
edit

Sure he might have his own theory/opinion of why God can't possibly exist, but there is no way for him to either prove or disprove it because God is not something a person can observe.
LOL

Then get to the point so the Master of comebacks can reply to your statement.