What God says about people who create their own God:
Those who fashion a graven image are all of them futile, and their precious things are of no profit; even their own witnesses fail to see or know, so that they will be put to shame. Who has fashioned a god or cast an idol to no profit? Behold, all his companions will be put to shame, for the craftsmen themselves are mere men. Let them all assemble themselves, let them stand up, let them tremble, let them together be put to shame.
The man shapes iron into a cutting tool and does his work over the coals, fashioning it with hammers and working it with his strong arm. He also gets hungry and his strength fails; he drinks no water and becomes weary. Another shapes wood, he extends a measuring line; he outlines it with red chalk. He works it with planes and outlines it with a compass, and makes it like the form of a man, like the beauty of man, so that it may sit in a house. Surely he cuts cedars for himself, and takes a cypress or an oak and raises it for himself among the trees of the forest. He plants a fir, and the rain makes it grow. Then it becomes something for a man to burn, so he takes one of them and warms himself; he also makes a fire to bake bread. He also makes a god and worships it; he makes it a graven image and falls down before it. Half of it he burns in the fire; over this half he eats meat as he roasts a roast and is satisfied. He also warms himself and says, “Aha! I am warm, I have seen the fire.” But the rest of it he makes into a god, his graven image. He falls down before it and worships; he also prays to it and says, “Deliver me, for you are my god.”
They do not know, nor do they understand, for He has smeared over their eyes so that they cannot see and their hearts so that they cannot comprehend. No one recalls, nor is there knowledge or understanding to say, “I have burned half of it in the fire and also have baked bread over its coals. I roast meat and eat it. Then I make the rest of it into an abomination, I fall down before a block of wood!” He feeds on ashes; a deceived heart has turned him aside. And he cannot deliver himself, nor say, “Is there not a lie in my right hand?” (Isaiah 44:9-20, NASB)