It was only during the early 20th century that American and European missionaries spread Protestantism with Mennonite and Pentecostal churches through the Sudan Interior Mission (SIM). When the SIM continued its movement after a brief ban during Ethiopia's war with Italy, it is written that the missionaries were taken aback by the fruits of their initial mission. Protestant Christians still face persecution in rural regions and are assisted by the Voice of the Martyrs; however, there is a growing tolerance between the Ethiopian Orthodox, Muslims and the growing population of P'en'tay Christians in the urban areas of the country. With the dominance of the Ethiopian Orthodox Tewahedo and the growing Muslim population, the population of P'en'tay Christians was estimated around 16.15 million (19 percent of total population), according to the information released by the U.S. Department of State.