If you believe you know for certain there is no God or higher being, you're as full of shit as anyone who believes they know for certain there is. About that, Melinda is right.
Only in the most sophomoric way. People love to think of that as some sort of exploitable crack in the door of the whole atheism argument, and fortunately the Flying Spaghetti Monster fits through there as well. I can promise you I accord the same degree of respect and probability to YHWH as the FSM gets.
When dullards get offended over the idea of Godlessness, it's the vanishingly small probability of their particular God existing that they feel comforted by when the "you can't disprove it" line comes around: they're not thinking about Abdul's God or Tajinder's God or the god of some alien species somewhere. Pascal left the roulette wheel out of his wager. (Note that I am referring to unnamed and unidentifiable dullards and not all the swell people who quite reasonably feel insulted by the foregoing paragraph. Thanks Melinda!)