Does anybody have any idea about where I can find the census data of Nepal?

Hope this might help ya.
http://www.census.gov/cgi-bin/ipc/idbsum?cty=NP

I need it on the base of race and religion.Please help.

Thank you ,Matrix Rose.But does Nepali government have any data regarding this?

Hmm i dont know if this will help you or not but still give a look.

http://www.nepaldemocracy.org/ethnicity/ethnic_demography.htm

Here is the latest from Nepal?s 2001 census:

Nepal?s 2001 census enumerated 103 distinct caste/ethnic groups including an "unidentified group". The caste system of Nepal is rooted in the Hindu religion while the ethnic system is rooted in mutually exclusive origin myths, historical mutual seclusion and the occasional state intervention.

The major caste/ethnic groups identified by the 2001 census are Chhetri (15.8%) Hill Brahmin (12.7%), Madheshi (33%), Magar (7.1%), Tamang (5.6%), Newar (5.5%), Muslim (4.3%), Kami (3.9%), Rai (3.9), Gurung (2.8%), and Damai/Dholi (2.4%). The remaining 92 caste/ethnic groups (including the world-famous Sherpa, each constitute less than 2 percent of the population.)