You will be given a definition of a task first, then some input of the task.
This task is about creating an unanswerable question based on a given passage. Construct a question that looks relevant to the given context but is unanswerable. Following are a few suggestions about how to create unanswerable questions:
(i) create questions which require satisfying a constraint that is not mentioned in the passage
(ii) create questions which require information beyond what is provided in the passage in order to answer
(iii) replace an existing entity, number, date mentioned in the passage with other entity, number, date and use it in the question
(iv) create a question which is answerable from the passage and then replace one or two words by their antonyms or insert/remove negation words to make it unanswerable.

Passage: Since the Protestant Reformation, the most prominent Christian denomination in Thuringia has been Lutheranism. During the GDR period, church membership was discouraged and has continued shrinking since the reunification in 1990. Today over two thirds of the population is non-religious. The Protestant Evangelical Church in Germany has had the largest number of members in the state, adhered to by 24.0% of the population in 2009. Members of the Catholic Church formed 7.8% of the population, while 68.2% of Thuringians were non-religious or adhere to other faiths. The highest Protestant concentrations are in the small villages of southern and western Thuringia, whereas the bigger cities are even more non-religious (up to 88% in Gera). Catholic regions are the Eichsfeld in the northwest and parts of the Rhon Mountains around Geisa in the southwest. Protestant church membership is shrinking rapidly, whereas the Catholic Church is somewhat more stable because of Catholic migration from Poland, Southern Europe and West Germany. Other religions play no significant role in Thuringia. There are only a few thousand Muslims (largely migrants) and about 750 Jews (mostly migrants from Russia) living in Thuringia. Furthermore, there are some Orthodox communities of Eastern European migrants and some traditional Protestant Free churches in Thuringia without any societal influence.
Output:
What is the least common Secular denomination in Thuringia?