The word 'ideology' was a word coined by the Frenchman Antoine Destitt De Tracy (d. 1836), with the aim of scientifically studying thought and action; a kind of 'science of ideas'. It was later appropriated by the German intellectuals Karl Marx, Friedrich Engels and Karl Mannheim, eventually developed further by the Marxists.
Where does that leave the people who waffle on about The (Singular) Islamic Ideology? Floundering. By their own logic of rejecting Westernisms (e.g. democracy) on the basis they're incompatible with Islam, they should not be turning Islam into an ideology. Appropriating the early Marx's use of ideology, I will say that those who promote The Islamic Ideology turn the circumstances of Muslims upside down as in a camera obscura. They offer a form of messianic religion, under which the emergence of The Islamic State will mystically solve All The Problems Of The World.
The reality is, however, that they seek power and domination (contrary to some Muslim traditions) to liquidate all those who may oppose their own ideology and political beliefs, as 'enemies of Islam'. They are more Western than they would ever care to admit. Thankfully, most Muslims are happy to ignore the prattle from the Party.