by this calculate (litterally googled "how many people died by god) he killed only 25m. Hitler is still on the top. http://dwindlinginunbelief.blogspot.co.il/2010/04/drunk-with-blood-gods-killings-in-bible.html
Technically God killed more because he created universe, thus he's responsible for every single genocide...
lol at that that capitalist number game of lies. Why debate a socio-economic model when u can just make up that it killed 344252315234232432 people and be done with it. China the most populated country on Earth that even had to make up a one-child policy to keep it's numbers down but apparently communists still managed to kill everyone lol.
I think that Nature killed the most with old age,laws of fizics,biology,viruses and basic impulses on emotions.
What Nature gave it to us, it takes it back, no problem with it lul The worse is what mankind did, especially in the name of "God"