Yep, all of the percentages sound great until you get a few from a non-religious web site. Not to mention if you just take percentages, and don't apply intelligence to them as Celmak has obviously neglected to do, you get something like this:
Percentage of Muslims (1996) 26%
Islam annual growth rate (1994-1995) from U.N. 6.40%
Christianity growth rate (1994-1995) from U.N. 1.46%
Muslims are growing rapidly. They must be right.