I want to know the answer to the following question:
Is this identifying factor for official citizens of Greece still in effect today ?
All the background I'm provided with is that "A century later, when the Treaty of Lausanne was signed between Greece and Turkey in 1923, the two countries agreed to use religion as the determinant for ethnic identity for the purposes of population exchange, although most of the Greeks displaced (over a million of the total 1.5 million) had already been driven out by the time the agreement was signed.[note 1]". Is that enough to answer the question?
Answer: no