There was a survey done on the members of the royal institute a few years ago, and iirc, it came out that about 8% believed in some sort of god. (Not necessarily theistic). Interestingly there were no biologists among them.
I'll see if i can google it when i get near a pc.
I'm not sure why theists feel the need to grasp the coattails of the odd (normally fruitloop) scientist who states a belief in God.
If you compare the number of scientists that were believers in the nineteenth century to the number of believers now you will see a very sharp drop.
I would hazard a guess to say that the next generation of scientists will contain no theists at all.