Especially since the aborted coup and then the state of emergency, we are seeing that Turkish President Erdogan is basing his legitimacy on both nationalism and radical Islam. When these two ideologies come together they're sometimes referred to as “neo-Ottomanism”. It is an attempt to kind of rekindle the glories of the Ottoman empire, which was an exclusionist empire. Of course, this ideology needs its targets, its scapegoats. Unfortunately, Turkey's religious minorities, who are already going through very difficult times, end up being very convenient targets, especially Christians and Jews. But it's not only them; it's also some non-Sunni Muslim minorities like the Alevis or the Shiites. Similarly, Turkey's atheists, agnostics, and deists have recently become targets.
Basically, anyone who doesn't fit within the straitjacket of Erdogan's preferred view of the world can easily become a traitor, a fifth column, a public enemy. This is an alarming trend that we continue to observe.