Oh the futility of it all. Man needs to feel special, so man created God. And religion was created, not just one, because "God" works in mysterious ways. He decided to make his word very vague because God likes to watch man passionately kill each other and beat each other to death over the different interpretations. Man created God to be one sick individual.
About the Galaxy Song, it is from Monty Python's The Meaning of Life(1983). The scientific "facts" in the song are very accurate but there are some errors like (from Wikipedia) '"the Sun is 'the source of all our power'." In fact, geothermal power, tidal power, nuclear power and light from other stars do not stem from the Sun.'
A study of the song's scientific accuracy can be found here and here.
Most numbers cited in the song are very good approximations. Much better than the bible's Pi.
Here is the original version of the song from the movie: