Yes. As I said, it's a personal thing whether people sign it or not.
I personally think the Millenium dome was a waste of tax money, so is a mega mosque.
On a more personal note I think it's disgusting how much tax money is spent in London anyway, England and indeed the rest of the United Kingdom is bigger than that!
I would sign the pettition if it was a mega christian church also. Religion is something I'm not a great fan of. I think people can have their beliefs and worship who they like, but why should I be paying for it?