Of course it was. As an atheist it is understood that no God ever proposed to you by anyone else, ever, is real. So when the OP asks "if God existed" that would have to be a God of YOUR OWN design. Since you've already rejected every God of everyone else's design. So inventing your own God is the only possible speculative option left.
Well, they clearly think they are far smarter than any theists, and they seem driven to remind is all of it at every possible opportunity, so it was reasonable to expect lots of opinionating.
(And there it was.)
Well, speculation is a good way to learn new things.
The question was not about whether or not God exists. It was;
IF God existed (in your worldview), what then? You (the atheist), were being invited to speculate on the possibility of
your concept of God existing. If you had no intention of bothering to speculate, that's up to you. But why the need to insult anyone else who finds such speculation meaningful, informative, or otherwise interesting?