I came across this 2007 survey about British public attitudes towards religion and other beliefs such as ghosts, telepathy, witches, and the like. The survey found that only 37% of the respondents said that they considered themselves religious but a much larger 56% said they believed in god. So there must be many who think that being religious involves more than believing in god, such as attending religious services or being involved in other religious exercises.
But I was more surprised that while 56% believe in god, only 36% consider themselves to be spiritual. I had imagined that the spiritual group would be larger than the group that believes in god, since saying one is spiritual usually covers all manner of vague beliefs including god. What does it mean to believe in a god but not be spiritual?
I found the responses to various superstitions to be interesting too. It looks like about 20-30% of people are susceptible to superstitious beliefs. As much as 38% believe in ghosts and an astonishing 36% say that they have actually seen a ghost.