Be careful who you agree with. Here are a couple reasons. First, the question was do you know for certain there is no God. It is impossible for anyone to answer the question yes, even though some did. You may want to look up the word impossible. A million years from now it will still be impossible to answer yes.
Second, he doesn't have good reading comprehension. The question was about God existing, which most people would assume the asker of the question meant higher power or Creator of the universe, and he talked about people inventing religion. Of course people invented religion, but a Creator and religion have nothing to do with each other.
Three, again as the question was about KNOWING and you commented on a better chance which means odds or probability. With two entities that we have absolutely no physical proof of it is ignorant to say which has better odds, not to mention odds do not matter in a case of absolute certainty.
Now after all that you really dropped off the deep end when you said there is some evidence that intelligent life has visited us. LMAO omg you cannot be serious. You step in here and try to promote intelligence while you demand physical proof of a Creator, yet you believe aliens have visited us from somewhere in space because you watched ufo stories on TV?