I signed a few of the petitions on the Number 10 site/ One of these called for a ban on government-funded faith schools. 3191 people signed it and now you can read the response. Basically, they dismiss it.

I am increasingly of the opinion that religion should be kept out of schools. We can't stop it in homes, but the government should not be encouraging the isolation of children from society in general. By all means teach them what the various faiths are about, but also teach them about the wonders of science and give them a chance to make up their own minds.

A quote I've seen used by Richard Dawkins is repeated here:

"good people tend to do good, evil people tend to do evil, but for a good person to do evil–that takes religion."

Sounds about right to me. I won't bother quoting the obvious examples from just about any faith. I'm sure most religious people are good, but you can be good without believing in fairies or whatever.