I'd urge you to refrain from baiting the fundamentalists... They don't celebrate the prophet's birthday, they have loudly and repeatedly declared the celebration of it to be an "innovation", "neo-paganism", "neo-christianism"... Some muslims celebrate birthdays in the family too. It's a cultural thing anyways, if you do or don't, makes little next to no difference. Some people celebrate anything, and some celebrate almost nothing :)