Here are some Cambridge University websites that you could find interesting and helpful. In general, Cam Uni societies are open to Anglia Ruskin University students, and the faith societies are usually very welcoming.
http://www.srcf.ucam.org/cuc/
promotes interaction between Christian groups
http://www.srcf.ucam.org/socs/
hosts many of the Cam Uni societies, including many faith ones
http://www.christiancambridge.org.uk/
the site of the college and university chaplains
http://www.cam.net.uk/home/interfaith/ifg_links.html
Not necessarily Uni, but good links to lots of religious societies