A well known opposer of the Dawkins brigade has said that he has been approached privately by loads of scientists who are scared of ridicule of their colleagues and so keep their beliefs to themselves.
I'm not sure a questionnaire is going to give a true reflection.
How old are your kids?
My experience of having to go to church on a Sunday morning was a complete boring chore and I couldn't wait to be old enough to have a choice and not go.
No chance of brainwashing there.