The place to knock is inside of you. Where else would a God live?
Of course, the answer to this question entirely depends on how you define "god". Most definitions there have been of god throughout history have been external to the human body (albeit able to store aspects of themself within those bodies).
Looking inside oneself to find god seems like an impossibility. Looking deep inside myself, I will ultimately find.....me. And while I am indeed shockingly incredible, I am not quite so without humility as to regard myself as god - not in any definition of "god" I've ever encountered.