Because of the immigration of Uskoks, the region is the intersection of all three Croatian dialects. The descendants of Uskoks who are Štokavian speakers are the majority in the Žumberak Mountains. The Žumberak Uskoks were mostly Orthodox Christians of the Serbian Patriarchate of Peć, but during 17th and 18th centuries came under the Union with Rome and became Greek Catholic, so there are more Greek Catholic churches in the Žumberak Mountains than Latin Catholic churches (approx. 2 to 1).