RF is a multi-confessional country. There are ~70% of christians, but some regions population nearly 100% muslim... There are also regions with ~100% buddhist.
Here:
Russian Orthodox (41%)
Muslim (6.5%)
Unaffiliated Christian (4.1%)
Other Orthodox (1.5%)
Neopagan and Tengrist (1.2%)
Tibetan Buddhist (0.5%)
Other religions (1.7%)
Spiritual but not religious (25%)
Atheist and non-religious (13%)
Undecided (5.5%)
http://en.wikipedia.org/wiki/Religion_in_Russia