They believe that being born again is accepting Jesus Christ as their personal Lord and Savior. Catholics believe that being born again is the process you undergo when you are baptized. They do not believe baptism is necessary. Catholics do.
A Pentecostal believer in a spiritual experience may vocalize fluent, unintelligible utterances (glossolalia) or articulate an alleged natural language previously unknown to them. Catholics do not do this, and we believe what is clearly explained in the bible about speaking in tongues. We understand it to be the process by which someone speaks and everyone listening can understand them regardless of what language they speak. This is clearly demonstrated in the Acts of the Apostles and there is no such thing as anyone speaking unintelligible utterances. Speaking in tongues also relates to wisdom.
They teach sola scriptura. The Catholic Church considers sola scriptura a heresy. The bible teaches that the Church is the authority, that it is the ground and pillar of Truth, not scripture.
They do not believe that baptism does anything for you, but that it is just a symbolic gesture. Catholics believe that it removes sin from the soul, and that the person is reborn in Christ., and more.
They believe in believers baptism, therefore they do not baptize their infants. The Catholic Church baptizes infants and we do not believe in believers only baptism.
Pentecostals do not celebrate the Eucharist, and they do not believe in the True Presence. They do occasionally participate in what they call the Lordâs Supper, but they do not believe that it is the Body and Blood of Christ. They believe it is only a symbolic gesture that Christ asked us to do, nothing more. Catholics celebrate the Eucharist at every Mass, believe in the True Presence of our Lord, and believe that it is truly the Body and Blood of our Lord.
Catholics believe that Mary is the new Eve, the Ark of the New Covenant by which our Lord came into the world. We believe that Mary is the mother of all Christians, that she provides special intercessions for us (she prays for us). Pentecostals do not recognize her or ask her to pray for them, and consider that blasphemy.
Catholics ask the saints in heaven to offer intercessory prayer for them, because we believe that the saints in heaven are alive and can and do pray for us. Pentecostals do not do this because they reason that they are dead, and they most likely believe that intercessory prayers of the saints is a form of worship or talking to the dead, which God would not be happy with.
Pentecostals do not believe in confessing sins to anyone other than God. Catholics confess their sins to a priest.
Okay, I think I thought of all the major differences. I hope that is enough.