That's kind of true - ISIS was allied to Al Qaeda and split off around 2006 when they realised they could capitalise on the disorganisation of the new Iraqi state during the periods of insurgency, corruption and maladministration of the US occupation. They then mounted successful military campaigns to capture the major cities in the areas that the weak Iraqi military could not defend.
It's a safe bet to say that with no regime change in Iraq, ISIS as we know it would not exist. It is precisely because we had chaos in Iraq and the Middle East due to the misadventurism of Bush, Blair and Howard that ISIS was able to function as an alternative military force and capture territory in Western Iraq - and form Caliphates which became incredibly powerful ideological tools that allowed fanatical Islamists to actually rally in geographical areas and then mount propaganda campaigns into Southeast Asia, the rest of the Middle East and even into the West.
Al Qaeda never had a significant geographical territory nor the sophistication of propaganda/PR that ISIS has.
You can call this *smile* if you want, but all you are demonstrating is that you have no understanding of recent history, and just saying "it's *smile*" doesn't cut it.