Personally, I say “there is no god”, because I also say “there is no pink space unicorn hiding behind Pluto”. I don’t know either for sure, but if a kid asks me and I start humming and hawing whether there might be pink space unicorns behind Pluto, then that sends entirely the wrong message.

So, the difference between agnosticism and atheism is pure semantics to me. I do not claim to know that there is no god. But I assume there is no god until proven otherwise.