Still wrong. But keep repeating it.
Look up Al Zarqawi's biography. Back to 1999.
If Saddam still ruled Iraq, the flash point for radical Islam would have been Afghanistan, Yemen, or Syria. Possibly one of the northern African Sunni nations. Not to keep hammering a point, this crap didn't start with the war in Iraq, or even with 9/11.
If the war in Iraq had never happened, it's probable that the only difference now would be that ISIS would be called ISS.
As the Washington Post article I linked to pointed out, the group was practically dead in the water until 2009.