"a religion regarded as unorthodox or spurious ; also : its body of adherents"
Exactly why this is not a cult. And even if anyone was speaking in tongues, that would make it a religion and not a cult as taht activity is in the very book upon which all Christianity is based....the bible. Speaking in toungues has been around for two thousand years. Perhaps you should go read about the day of 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."
Finally, that particular preacher was from Africa where I would suspect they have somewhat different traditions than here or in Alaska. I would suspect part of your issue is due to your view of the cultURAL differences...not cult differences.