One thing I find odd from the text itself is where Nebuchadnezzar blesses God: Blessed, says he, be the God of Shadrach, Meshach, and Abed-nego! Ask yourselves as believers do you bless the God of Sam, Bill, and Emma IF He is your God? Do you not find that strange language? Why does he not speak of Him as *** HIS *** God?
I don't think anybody believes that Nebuchadnezzar was converted when he said that in Daniel 3. We're talking about later, after his humilation and restoration.