What percentage of the world's religious population is Christian?

If you combine Catholics, Protestants and Eastern Orthodox together, believe it or not I think its a solid 60%, the two biggest being Catholic and Orthodox believe it or not. Orthodox Christians in fact outnumber protestants, because of Russia and the Balkan's massive combined population, however they are not as numerous as Catholics, who can be found in most of Europe, pretty much the whole of Latin America, and throughout Africa.