Not directly, and not by France's in isolation, but it was very very much indirectly caused by what western (and other) countries have done in the region the past 100 years, and especially the past 25. Of course it's not the only cause either, but especially with the specific case of ISIS, the 2003 Iraq invasion was extremely crucial for the form and extent it took.
He wasn't political aware. He was a low life criminal, that couldn't fit into a western society, that got radicalised in Jordan/Syria (pre the war) and in prison.
Omar's radicalisation had very little to do with the actions of the west in the middle east.
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Islamism is an evil similar to Stalinism, Nazism and Fascism.
