Nothing was said about God's existence until you brought it up. A negative claim is still a claim.
I said there's no evidence for god's existence, and therefore believing in it is nonsense. That's how it works. When it comes to assessing whether or not something exists, you don't need negative proof, you just need a lack of positive proof. It's why we don't take the idea of a teapot orbiting the sun somewhere between Jupiter and Saturn, or invisible pink unicorns running around seriously. The fact that god somehow deserves special privilege in your book in that in this one specific case, it's suddenly up to nonbelievers to prove that it's irrational and not the other way around is exactly the kind of bullshit that I mentioned in my earlier post.
Really now, by your logic, I could claim that I am King of the Space Fairies, a race of wizard goblins who live on Mars, and as long as you bring up how fucking stupid that is first, then suddenly magical space wizards is the default and it's now up to you to disprove it, rather than on me to prove it.
"Atheism is inherently more rational."
And you wonder why atheists are stereotyped as smug and condescending.
Irrelevant.
Fact is, plenty of rational people are theists, and plenty of irrational people are atheists. Neither side can seriously claim superiority when it comes to rationality.
Furthermore, not everybody is an atheist for rational reasons. There are many, many people who become atheists because of emotional reasons, because of some ideology, or just because religion doesn't speak to them.
I said atheism, as in the idea itself, is more rational than theism, not that an individual being atheist is necessarily proof that they're a rational person. Of course, whether individual atheists are overall rational people is irrelevant to that point, and to say otherwise is a textbook ad hom. It's on the same level as people who say "vegetarianism is bad because Hitler was a vegetarian".
That said, though, theism is, at the very least, strong evidence that someone is not rational. In much the same way as your example of an atheist who believes in ghosts or a non-theistic religion.
Yet again, we see you making a claim without any evidence to back it up. Like it or not, saying religion is nonsense is a claim. You're the one making the claims here, so you're the one who has to back them up.
Nope. "God exists" is not the default. Who mentions it first is irrelevant.