The fact that humans are limited in their understanding or conception of God to our particular experience of our own minute existence does NOT mean that God does not exist.
It DOES draw our attention to the inadequacy of our religions, philosophy's etc to have any complete sense of God. And why should we? Our galaxy has over 200 billion suns at least as big as our own with even more planets. And our galaxy is of medium size in the billions of other galaxies in the universe.
Our senses and mental comprehenshion are optimized for our own survival on this tiny speck in the universe. And you think the fact that we don't fully comprehend the creative force of this universe and potentially other universes means it doesn't exist - or its limited to what you can imagine? I hope you're starting to appreciate how provincial these views are.