Words do have meanings, naturally, but the problem is the presupposition that comes with the words, especially such a small and vague word as God, which explains a wide range of things, really. Let's face it: we have panentheists, pantheists, dualists, soft polytheists, hard polytheists, henotheists, and Deists who all use the term "God" to refer to their (or one of their) gods. That's a lot for such a small word.
For most people in the West, the word "God" tends to have an Abrahamic feel to it: Creator, King, Judge, and so on. Yet in the East, God does not necessarily have the same personal attributes. It gets more complex, really, with people's individual as opposed to communal views on God, which can vary.
Before one can even begin to discuss whether God exists or not, one needs an explanation on what the God is that they believe in - but not everyone believes "God" is Abrahamic as we know, so what do we do?