Greek citizens who are Roman Catholic are estimated to be at around 50,000 with the Roman Catholic immigrant community in the country approximately 200,000. Old Calendarists account for 500,000 followers. Protestants, including Greek Evangelical Church and Free Evangelical Churches, stand at about 30,000. Assemblies of God, International Church of the Foursquare Gospel and other Pentecostal churches of the Greek Synod of Apostolic Church have 12,000 members. Independent Free Apostolic Church of Pentecost is the biggest Protestant denomination in Greece with 120 churches. There are not official statistics about Free Apostolic Church of Pentecost, but the Orthodox Church estimates the followers as 20,000. The Jehovah's Witnesses report having 28,874 active members. In recent years there has been a small-scale revival of the ancient Greek religion, with estimates of 2,000 people active practitioners, and 100,000 "sympathisers".

Answer this question, if possible (if impossible, reply "unanswerable"): How many churches does the biggest Protestant denomination have?
120