Ok, are you talking about total casualties on both sides? Or are you saying American casualties? Or Japanese casualties? I am talking about American casualties, and no, there would have never been a million American casualties. You consider pikes a legitimate weapon against an M1 rifle, flame throwers, grenades, bombers, attack aircraft, tanks, battleships, artillery, machine guns? You are hilarious!
One thing I read points out that the folks with piles wouldn’t have had uniforms, which at the time would have been out of the norm I believe. It’d have been hard to tell who was the enemy. Plus i bet a culture that values honor and fighting to the death wouldn’t care about a high body count. Taking one GI out would have been enough. Plus, how many civilians do you think there were compared to the allies?