Weren't the Greeks (as well as the Bulgarians, Macedonians, Serbs, etc.) under the heel of the Muslims for hundreds of years? Wasn't it the "evil" western powers who freed them from their yoke of oppression during WWI?
How quickly they forget.
They were under control of the Ottomans from around 1452 (when Constantinople fell) to 1829. As far as Muslim rulers go, the Ottomans were pretty lenient. Also of note is the fact that the [heavily Muslim] Arabs are also strongly anti-Turkish/anti-Ottoman. Greece largely won its independence by itself.