Mingled vanity and pride appear in this, that when miserable men do seek after God, instead of ascending higher than themselves as they ought to do, they measure him by their own carnal stupidity, and neglecting solid inquiry, fly off to indulge their curiosity in vain speculation. Hence, they do not conceive of Him in the character in which He is manifested, but imagine Him to be whatever their own rashness has devised. This abyss standing open, they cannot move one footstep without rushing headlong to destruction. With such an idea of God, nothing which they may attempt to offer in the way of worship or obedience can have any value in His sight, because it is not Him they worship, but, instead of Him, the dream and figment of their own heart. [I.4.1]
It has always been man's tendency to create a god of his own liking, a non-threatening god in his own image. It extends back to the garden when we were told, "You can be like God." It continues widespread today, and only God Himself, by His Holy Spirit, can open our eyes to see the falsehood and futility of such thinking. Without God Himself bringing us to a knowledge of the truth, we can never imagine a God who is, after all, bigger than we can imagine.