Lets all stick to the issue at hand. What does the Bible have to say about whether or not there is a plurality of Gods? What does the bible say about the nature of our God. Was he once a man before he became God?
Gen. 1:26
¶ And God said, Let us make man in our image, after our likeness: and let them have dominion over the fish of the sea, and over the fowl of the air, and over the cattle, and over all the earth, and over every creeping thing that creepeth upon the earth.
Gen. 3:22
¶ And the LORD God said, Behold, the man is become as one of us, to know good and evil: and now, lest he put forth his hand, and take also of the tree of life, and eat, and live for ever:
Gen. 11:7
Go to, let us go down, and there confound their language, that they may not understand one another's speech.
Or does God just think that using the "royal 'we'" is the cat's meow?
I think that what Joseph says himself covers what the Bible says about it quite well in his sermon.