What would happen when the Christian message is introduced to various groups of people? How would their contexts and worldviews influence their responses to the message? To this age-old missiological question, the study takes the readers to a narrowed and concerted question, ""What is the effect of Pentecostal messages on animistic people,"" or in other words, ""What are results when the (Holy) Spirit meets the spirits of the tribal people?"" Julie Ma chose the Kankanaey tribe in the northern Philippines to prove that the Pentecostal type of Christian has invited a very positive response from the Kankana-eys. She approaches the matter from historical, anthropological and theological perspectives. This may challenge the readers to look more closely at the phenomenal Pentecostal movement, especially with their potential for mission. She also urges her fellow Pentecostals to be more appreciative of their heritage and to fully appropriate it to reach ""the end of the earth."" Julie C. Ma is a Korean Pentecostal missiologist who served in the Philippines as a missionary in church planting, theological education, and research on mission and Pentecostalism. Her publication includes Mission Possible: Bible Strategy for Reaching the Lost (Regnum and Wipf & Stock), Asian Church and God's Mission (OMF Literature) edited with her husband, and numerous academic articles. She also edited Journal of Asian Mission. Currently she serves as Research Tutor of Missiology at Oxford Centre for Mission Studies, Oxford, UK. She also represents the world Pentecostal Church in the General Council of Edinburgh 2010.