When one says God one thinks of our Father who art in heaven. Of which there is only one, and that God told us not to take His name in vain. Use another name, not His.
He said it, and when you decide to ignore Him then you are going about to establish your own righteousness.
Romans 10:3 "For they being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God."
He is the creator. His rules. Abide by them or face consequences for disobedience.