What are the similarities os pentecostalism?

Having done a cursory search for pentecostal beliefs on the web, I must conclude they are all just another brand of protestant and they have few similarities even among themselves, much less with Catholics. Catholics belong to the Christian Church which was established by Our Blessed Lord, Jesus Christ on St. Peter (see Matthew 16:17-19), He then guaranteed it until the end of the world, and sent the Holy Spirit to guide it always. Pentecostals, for the most part are various groups descended from various protestants in the United States within the last century.