dunno what happened to my post but I had several points about this:

First, speaking in tongues is biblical ...check out the Pentecost form the bible (saee below). Casting out evil demons such as LEgion of Lots is also biblical (see below). If your position is correct then every sect of Christianity is a cult which of course is ridiculous:

Pentecost:

In the biblical account, the events took place on the day of the Pentecost, in Jerusalem, at 09:00 ("the third hour of the day", according to Jewish timekeeping). The community of Christ's disciples, approximately 120 people, were gathered "into an upper room" in a building that Tradition locates on Mount Zion. The Tradition also says that it was the same room where Jesus ate His Last Supper. The phenomenon is described in Acts 2:1-4:

And when the day of Pentecost was fully come, they were all with one accord in one place.
And suddenly there came a sound from heaven as of a rushing mighty wind, and it filled all the house where they were sitting.
And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.
And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.
The phrase "a rushing mighty wind" is almost a literal translation of the Hebrew word ruah, meaning in Hebrew texts the Spirit of God. The author of the Book of Acts goes on to describe how the apostles spoke in languages they had not learned (xenoglossy). While visitors to Jerusalem from around the Roman Empire understood the languages spoken, some misunderstood and thought that the apostles were drunk.

The New Testament records that many Christian converts experienced the same extraordinary gifts. The modern Pentecostal and charismatic movements believe that these gifts are still given today when Christians are baptized in the Holy Spirit in a personal Pentecost. Such Christians believe that when they 'speak in tongues' (practise glossolalia) they are engaging in the same activity as at Pentecost.

as for driging out evil spirits...recall Legion from the bible:

See Legion (disambiguation) for other concepts with this name.

Jesus healing the man from Gerasa. Medieval illuminationLegion, also known as the Gerasene demon, or translated as Lots, is a demon found in the Christian Bible in Mark 5:9 and Luke 8:30. A parallel version of the story can be found in Matthew 8:28-34, but this version does not contain the name "Legion" and tells of two men, not just one, possessed by a multitude of demons. In the story, Jesus traveled to "the country of the Gadarenes" (Luke 8:37), "the country of the Gergesenes" (Matthew 8:28), or "the region of the Gerasenes" (Mark 5:1) and met a man possessed by an evil spirit, which spoke to Jesus in a conversation. The most commonly quoted version is found in Mark 5:9:

And he asked him, What is thy name? And he answered, saying, My name is Legion: for we are many. (KJV) [it is argued that the phrasing is, "we are legion, for we are many"]
Another version of the quotation is in Luke 8:30:

And Jesus asked him, saying, What is thy name? And he said, Legion: because many devils were entered into him. (KJV)
In some versions of the Bible, the quotation is different: We are mob, for there are so many of us

The demons that comprised Legion were aware of the tremendous power of Jesus, and begged to be spared from being tossed back into the bottomless pit of Hell (none of the words translated Hell in the Bible are used, those being sheol, Gehenna, Haides, tartaros; rather, in Mark 5:10, the Greek word choras is used, translated "country" but more accurately meaning an empty expanse, and in Luke 8:31, the word abyssos is used, meaning a bottomless depth). Jesus instead cast the demons out of the man and, granting their request, allowed them to dwell in a herd of pigs. The pigs then drowned themselves in the Sea of Galilee.