Interesting theory, Morsul! I also like the idea that Tom Bombadil is Eru, but I don't necessarily believe it. Still, the thought of this great sage god hopping around a forest going "ring a dong dillo!" all the time is quite amusing
But Tom has the life, though. He gets to run around the woods and gather water-lillies for his "pretty lady" and sing random syllables and save hobbitses from nassty demises. Seems like a pretty good existence to me.