The table below summarizes various estimates of the Iraqi casualty figures. Iraq Body Count numbers are on the low end compared to the others. I don't know where you got your info but
this American/Al-Jazeera article is taking the figures from the PLOS Medicine Survey. And this
Al-Jazeera article quotes the same figures I posted below.
The custom for Muslims is to bury within 24 hours if possible. Your comment about bodies lying around is just snark.
Iraq Body Count project 112,667–123,284 civilian deaths from violence. 174,000 civilian and combatant deaths[1][2][3][4] March 2003 to March 2013
Iraq Family Health Survey 151,000 violent deaths March 2003 to June 2006
Lancet survey 601,027 violent deaths out of 654,965 excess deaths March 2003 to June 2006
Opinion Research Business Survey 1,033,000 deaths as a result of the conflict (Widely rejected as credible) March 2003 to August 2007
PLOS Medicine Survey[5] Approximately 500,000 deaths in Iraq as direct or indirect result of the war. March 2003 to June, 2011
Classified Iraq War Logs[1][6][7][8] 109,032 deaths including 66,081 civilian deaths.[9][10] January 2004 to December 2009