Pitfalls in Solely Relying on Acts for doctrine?

[Sam]

How many of the folks who "speak in tongues" in Pentecostal churches actually speak in a "language" and how many have had their chins wiggled and how many have been shaken so their words come out garbled, and how many have been told to keep repeating certain words or sounds until they get their tongue tangled up and gibberish comes out? How honest are we in facing this? There was a recent post about Bro. Joe Duke and how many received the Holy Ghost Baptism in his ministry but some who were there were honest enough to admit he had folks repeat "nonsense syllables" until they came out jumbled enough to be called "tongues."