Time for this one: let's assume there is this really powerful god who could let everyone know that he existed, and wanted everyone to know he existed. If there was such a being, we all would know he existed
There would be no way to not
know, positively, that he existed. There would be no atheists who do not believe he exists, or "agnostics" who are not sure if he exists. We would all know that there was a god, the way we all know that there is the sun. Other than the severely mentally ill, there are no atheists or agnostics on the existence of the sun.
Since we do not all know of this god's existence, we have to re-examine our initial assumptions about this god. So, our choices are: 1) the god exists, but is not powerful enough to let every one know about him, 2) the god exists, but does not want everyone to know about him, or 3) this god does not exist so there is no god to know about.
If there is a hole in my logic, dennis, please point it out because I need to know. This is like, Chapter One of my atheist book. In fact, this is all of my atheist book. The rest is filler and jokes.