Although many Turks dislike the term "State Islam", it has to be stated that Islam is organised by the state. Sunnis who consider this an unacceptable innovation are not allowed to organise. Although Sufi orders exist, some even with a vast membership, they have been officially forbidden banned since the 1920s.
The main problem religious communities identify is their lack of legal status as religious communities. In the late Ottoman period some religious minorities had legal status under the millet system, but the Islamic community had no separate legal status as the state
was considered to be Islamic. But since the founding of the Turkish republic, any such status has disappeared. Some Muslims are concerned about this lack of legal status, especially minority Muslim groups within the dominant Sunni majority, as well as the
Alevis, Shias and the Sufi orders. But few Muslims are prepared to voice their demands for legal status openly, for fear of imprisonment, although in recent years the Alevis have become more vocal. This has led to their gaining some recognition as associations, though not as religious bodies.
Religious meetings and services without authorisation remain illegal, though it remains unclear in law what constitutes legal and illegal worship. The Ottoman millet system recognised some religious minorities and the 1923 Lausanne Treaty spoke vaguely of
religious minority rights without naming them, but the Turkish authorities interpret this to exclude communities such as the Roman Catholics, Syriac Orthodox and Lutherans, even though these communities have found ways to function. Protestant Christian churches functioning quietly in non-recognised buildings are generally tolerated, but Muslims gathering outside an approved mosque are viewed as a threat to the state and police will raid them.
It is not possible for most Protestant Christian churches to be recognised as churches under current Turkish law. But in one bizarre case, a German Christian church was recognised in Antalya, but only by calling itself a "chapel" not a "church." Most Evangelical
Protestant churches in Turkey do not.
http://www.forum18.org/Archive.php?article_id=670&pdf=Y