Mafia? Since when did the mafia conduct religious warfare? And which one of these insurgency militias is the mafia:
Mujahideen Shura Council
Mahdi Army (Jaish-i-Mahdi)
Badr Organization
Fedayeen Saddam
Al-Qaeda in Iraq (Tantheem Al-Qaeda fi BiladirRafidain)
Jaish Ansar al-Sunna
Mohammad's Army (Jaish Mohammed)
Islamic Army in Iraq (Al-Jaish Al-Islami fil-Iraq)
Iraqi National Islamic Resistance (Moqawama al-Islamiya al-Wataniya, "1920 Revolution Brigades")
Islamic Resistance Movement (Harakat Al-Moqawama Al-Islamiya)
Islamic Front for the Iraqi Resistance (al-Jabha al-Islamiya lil-Moqawama al-Iraqiya - JAMI)
Jaish al-Mujahideen
Jaish al-Rashideen
Asaeb Ahl el-Iraq (Factions of the People of Iraq)
Black Banner Organization (ar-Rayat as-Sawda)
The Return (al-Awda)
Nasserites
Wakefulness and Holy War
Mujahideen Battalions of the Salafi Group of Iraq
Liberating Iraq's Army
Abu Theeb's group
Jaish Abi Baker's group
Islamic Salafist Boy Scout Battalions (Kataab Ashbal Al Islam Al Salafi)
for this to be a civil war there would definitely be more than even 150 killed a day.
According to who? And what number of casualties constitutes an official "civil war."