As to the question "How sure are you that there is no god?"
I put 99.9% but with the caveat that I am 100% all the gods man has thought of are not real but the chance there is something I can't 100% deny. Though if there is a god like being I am sure it is a character like "Q" from Star Trek than anything like the Christian god.
I am internally 100% sure there is/are no god/gods. However, in public discourse that gets reduced to 99.999...9% so that the burden of proof remains where it belongs. After 60+ years of being openly atheist, I have learned a thing or two. I also remain open to any information/evidence to the contrary. So far I haven't come across any.
I am also a 99.9 percenter. I am 100% positive that the petty, violent, sexist gods made up by homo sapiens do not exist. I cannot be absolutely certain that someone/something isn't in charge of this universe in some way. I am open to credible evidence. This is on the assumption that "god" is the term we give to the creator/manager of the universe.
I am 100% sure that I have been presented with sufficient evidence to prove that a supernatural god/s exists or could exist. However, I also know that I don't know everything and that it is impossible for a god/s to exist in any form in any universe - but if evidence does come to prove a god's existence, then it will no longer be supernatural as it will have a natural explanation.
The same applies to any other supernatural phenomena too.
I guess for me to answer the question in the first place I need a strong definition for what is meant by "God." When it comes to the general concept of God or gods, I reject the claim as baseless, with no reason to accept the proposition itself as valid — that the world is not as it seems — without evidence. In that regard I'm a weak atheist (or de facto atheist, if you like that term). It basically comes down to lacking belief in those things claimed that lack any supporting evidence; it's not a 50-50 proposition to me, but I'm not at 100% certitude. On the other hand, as you mentioned, specific manmade gods are another matter entirely. I have good reason to actively disbelieve in Yahweh, for example, because I'm familiar with the culture origins from a regional pantheon, the adaptation to nomadic god, the evolution to most power god, and the eventual promotion to one-and-only God. In religion, the hand of humanity in the creation of God and gods is apparent, and I am quick to not merely dismiss the claims but directly disbelieve them.
Imo the prob comes when we try to agree on the definitions of "real," and even "being." I was raised to believe all of the "other" gods were "not real," and I am slowly coming to see that they were all as "real" to their contemporaries as God is to us.
I say "us" even though my "sureness that God exists" is exactly opposite yours simply bc when I say "God," you understand to what I am referring, more or less. Ergo, God exists, at least in some manifestation, right? The long white beard I srsly doubt tho lol
is somewhat of a slog, but worth it imo
I put the same thing down. Nothing is 100% except real things. I think to say your 100% on somthing that is unprovable is like saying you believe in god but you know he’s not real because you killed him kind of thing, or saying you know everything there is to know. No absolutes to things that are not real. Things like god are not things that need to be proven wrong, they need to be proven real before they can be tested.