And here I thought that would be unimaginable in the movie. Michael not have a Catholic ceremony, not even for his father's sake? Michael not invite his parents to his wedding?

Well, I must eat my words. I was checking out www.imsdb.com: The Godfather , and in an early draft of the script, that's just what they had in mind. Before Vito was shot, Michael tells Kay, "We'll have a quiet, civil ceremony at the City Hall, no big fuss, no family, just a couple of friends as witnesses." When Kay asks what his father will say, Michael responds, "As long as I tell him beforehand he won't object. He'll be hurt, but he won't object."

I see why they omitted that from the film though. With Michael discussing marriage with Kay, it would make his wedding to Apollonia in Sicily a bit unbelievable. I mean, how could he up and marry someone when he's practically engaged to someone else back home?