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I know of non denominational schools doing X-Factor type productions, and feel smug that my DC do a nativity in KS1 and Carol type songs in KS2 at their Catholic school. Of course, parents of those children would not share my opinion!
See how it goes though. I was rolling my eyes when DS was practicing "We are the world". The performance included turning off all the lights in the church, the waving of glowsticks and solos by some very talented children. It was magical.
After last years debacle at our catholic primary school (xfactor style) I had a word with our head and said something along the lines of " I like the kids having a good time but if the xfactor or being a sleb is touted as something to aspire to during the nativity then how do they ever get the guidance on what is important in life?" Will be watching with interest to see if they've become a bit more sensible this year!
If your DC's school is state-funded then it needs to be inclusive of all the DC attending, who may not be followers of the main brand of mythology the school peddles. Doing a non-serious 'Christmas' play that they can all relate to is reasonable.
If it's a private school that you're paying for then I guess your wishes count rather more.
Mind you, I remain a bit boggled by the parent I chatted to three years ago, after having sat through DS' Year One production of 'Whoopsadaisy Angel'. THis parent was whining about how schools 'don't do nativity plays'. I did ask her (politely) what she thought she'd just seen...