Sometimes people ask me this question, and this is the answer I give. Obviously I’m not going to do the whole topic justice, but here is my simplistic way of looking at the question.

First: what do you mean by “god”?

If you mean “god” as a concept, obviously it exists. Virtually everyone on the planet has some kind of concept of a god, and it is possible to have a conversation with references to a god and be confident of some meaningful exchanges of information.

If you mean “god” as a physical entity that currently exists then the relevant facts are all the scientific information we have gathered about the physical world. None of those facts indicate the existence of a physical god, so we can be exactly as certain that there is no god as we can be that there is no unicorn, no Easter Bunny, no Santa Claus etc. In my view that is a high level of certainty, but whether it leaves room for doubt could be a matter of opinion.

If you mean “god” as something else eg a non-physical entity, or an entity that existed in the past but no longer, then the burden of definition is yours to bear. If you can’t define what you mean, then you can’t expect me to argue whether it exists or not. That is “agnostic by definition”.

In my view of the world, “god” exists as a concept of human invention and does not exist as a real, physical entity. I think the facts available are sufficient to reach that conclusion with a high degree of certainty, and that the process of getting to that point is highly rational. Regarding other kinds of god, I deal with those on a case by case basis as anyone offers a definition of what “god” means.

Aren’t you glad you asked?