More people have been killed in the name of religion than all other worldly events combined.
Statistically this is not true at all! Those who use it as an argument are convinced they are correct, however the facts totally disprove this theory. This shows the statistics of wars and these other worldy events you talk about.
If you look at these statistics you will see that the claim you just made is totally false. If you click on the link and look just at wars, only one is classifed as a religious war. Clearly WW2 is the highest death toll and it was not caused by religion. You will further see that the chart about other things like famine and disesase. Not a single United States War has been a religous war.