Kelek's research subject is the parallel society characterized by Islam in Germany. In 2011, she said: "Being a Muslim is becoming a self-sufficient identity. And this identity consists only of being different — different from the Europeans, different from the Africans, different from the Indians. And this frightens me. do not state their difference in terms of an utter rejection of the society that hosts them, preparing to take over one day. I often hear those Muslim youngsters bragging that one day, this country will be theirs." She also criticizes those who see themselves as victims, saying: "Today, the Turks, or Muslims, are given full access to civil rights, to democracy and liberty — and they reject all that. They have access to good education, health care, social welfare, but they voluntarily choose to keep out, to stagnate in parallel worlds. [... How can they still consider themselves as victims, as the Jews once were in reality?"