Ok, donning my buffoon's helmet, I'll dispute this, partly because I think I mean something different from you with the term, something less ambitious.
From what I know of Ataturk, he made rather contradictory statements wrt religion, with some statements of his atheism, others the opposite, of the essential nature of religion.
But he was consistent in wanting the new state structures to exist apart from religious structures in their formation. That, to this buffoon, is an act of secularist nature. Compare and contrast, say, with Iran post-revolution, where state structures and religious structures form part of the same formation.
That's not a 'useless abstraction'.