Yes, I do think it is rude and dismissive, and tends to imply that people with faith are gullible numpties, which is perfectly obviously not the case. (I am an atheist).
I also agree with Frogs' post below: "the more hostile the anti-God brigade are, the more likely it becomes that people of any religious faith will be strengthened in their feeling that the secular system is actively opposed to everything that is important to them. Which in turn makes it more likely that they will want to educate their children in a school where they know their beliefs will be respected and supported, ie a faith school. ", but think that can be turned around.
I don't like being called the 'anti-god brigade' (or a 'brigade of any kind - usually the PC brigade' ). Some of the posts on that thread in favour of state funded faith schools made me - as a secular democrat - less inclined to the pragmatic half of my view about them being built on historically benevolent principles, and being (as MN-erpointed out to me) a way f some families to enter the catchment where house-prices are out of reach
In principle, I can't see a right way for any state funded school to discriminate against a child who lives next door on the basis of belief. BUT I do feel I hold that view alongside respect for individuals who have faith. And although I have on a couple of occasions been told stuff which I do consider a bit loony far-fetched and / or rude (and generally to do with DS's leg) it would be utterly iniquitous - and silly and unintelligent - of me to try and use that as a stick to beat intelligent, respectful, sensitive people who happen to be in the same religious spectrum!