You are very ironic in your statement. I use other people, real provable beings, to gauge my knowledge. All you use to gain knowledge is yourself and your own experience which means that YOU rather, are the one who views himself as the ultimate authority, since you don't measure your beliefs outside yourself and your own experience. Your belief in god, is just based on your own feelings and your own imagination, not through any objective criteria. Even though you claim god to be the ultimate authority, your knowledge claim for god is based on your own perceived authority.