Only about 15 percent of Turkey are fully performing muslims. In fact, it might be lower than that. The myth that Turkey is 99 percent muslim is just that: a myth. Turkey is a shithole and one can only understand this if one comes from a Western nation with western education back into Turkey. The nation is a third world country where democracy only nominally existed and still only nominally exists.
According to Mutafa Akyol a columnist of Hurriyat daily news of Turkey that 30 % of Turks are very pious and practice Islam, 50% moderately practice Islam and 20% are staunchly secular (in my view most of the Alevi).