The study focused on Lesotho and Zambia, which had HIV prevalence rates of 23.2% and 17% respectively in 2005. It found that Christian hospitals and health centres are providing about 40% of HIV care and treatment services in Lesotho and almost a third of the HIV/AIDS treatment facilities in Zambia are run by FBOs.
http://www.who.int/mediacentre/news/notes/2007/np05/en/index.html
While popularly held beliefs--and characterizations by US government officials--proport that many churches/temples/synagogues/mosques/etc. and faith-based organizations give money internationally, studies and news reports found that the overwhelming majority of religious-based international aid is Christian.
http://en.wikipedia.org/wiki/Faith-based_foreign_aid