Book excerpt: At just over a century old, the Pentecostal Movement accounts for over 500 million believers worldwide and continues to grow. Still, confusion abounds over what Pentecostals believe and teach about the Holy Spirit, worship, salvation, healing, and much more. In 40 Questions About Pentecostalism, Jonathan Black provides an accessible overview of the historical, theological, biblical, and experiential factors that make Pentecostalism a vibrant and worldwide Christian movement. He answers questions such as these: - How did Pentecostalism begin in the United States? - What do Pentecostals believe concerning the Trinity? - Do Pentecostals affirm the prosperity gospel? - What do Pentecostals believe about healing? - What is speaking in tongues? As with all the 40 Questions books, the question-and answer format offers readers targeted guidance on the questions that matter most to them, and controversial issues are addressed with robust scholarship and in a spirit of grace.