I can disprove that the Earth is flat with the incredibly varied, concrete, observable evidence that it is not. It comes in many forms and is undeniable, hence the lengths flat earthers have to go to to “prove” the evidence is all just a collection of lies that serve some nebulous, nefarious purpose (they don’t even agree on what that is) that serves some faceless evil group they prop up (usually “the deep state” or Jewish people). On the other hand, I do not have concrete, observable evidence that God does not exist. That’s the thrust of my point.