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A christening is not a party, it's a religous rite, promising to raise your son as a christian. It's a pretty serious ceremony and if it means NOTHING to you but a party (and "yours" apparently), you should cancel it.
I'm not religous, but I wouldn't disrespect someone's religion by mocking their ceremonies. Since you don't care about the religious aspect, why do it at all?
Just have a party at your house, or focus on getting married so that baby will have a family.