I’m an atheist. So why can’t I shake God?

[robvalue]

That is the most common definition I've heard. Everyone knows what it is.

Clearly, they don't. I don't.

The evidence suggests that everyone "knows what it is" because it exists only in their imagination. As soon as any actual, meaningful words are used to describe it, it contradicts with another theist's version. So either there's a God for each person, or else they don't know God well at all. Or more likely, it's all in their head.

No one has yet told me how I can distinguish between a god and an arbitrarily powerful non-God.