If your definition of God is physical such as the ocean, the planet or the universe, then its existence is obvious.
If your definition of God is metaphysical, such as love, then it's existence is also obvious.
If it is something in the metaphysical but not widely seen in the physical realm such as a proverbial "flying spaghetti monster", then I would say its metaphysical existence is obvious as it exists in our minds. But when it come to its physical existence, I would propose a hypothetical mind experiment.
Suppose we go back the the beginning of homo sapiens era, the proverbial "caveman era" and we are able to communicate with them. We then describe to them the iPad and all its functions. We even draw it for them on the caves. They would think its most likely not possible and categorize it not unlike the "flying spaghetti monster" to the metaphysical realm but not the physical realm. But the seeming impossibility in their minds of such an object's physical existence did not prevent such an object from existing through the advent of technology and the passing of time. Thus wouldn't this analogy be similar to the way we view the "flying spaghetti monster" at this point in time and technological advancement? And if your definition of God is something metaphysical but not widely seen in the physical realm like the "flying spaghetti monster", then would it not to keep an open mind of its future existence?
Read more: Is it possible for God to not exist now, but in the future?