If we cannot determine something as fundamental as whether god is real or not, then we have no basis on which to accept any particular god. If god cannot be detected or otherwise accounted for, then we cannot know who or what it is.
We can eliminate certain types or versions of god by simple inference. I do not believe that an interventionist god exists, seeing as we do not ever interact or experience this god (except in ways that are indistinguishable from delusion or hallucination or simple mistaken conclusions... which the followers of one deity will use when rejecting other deities, but not their own). The explanation that god is immaterial and impossible to prove does not matter here- that explanation actually makes it possible to disprove the concept of an interventionist god.
In the same way, we can study the qualities that are assigned to a particular god and compare them to its actions and to the rationalizations for those actions. If you define god a certain way, and your chosen god doesn't meet the criteria, then it either doesn't exist or is quite different from what you believe it to be, which might make you wish that it didn't exist.
We don't have to prove that there is no god. We can simply analyze each god that is offered up as the real one and determine if there is merit to the concept. Gods that don't make sense can be discarded. The most likely option, in my mind, is that god is not very concerned with this planet or its people; we're probably just some side effect of an experiment, destined to be wiped away once enough data has been collected.
That god cannot be disproven, and his nature is perfectly in keeping with the universe and our world as they exist. And he fits any of the considerations for other gods much better than they do.