The church at Colosse probably was a small church. One of its meeting places was the house of Philemon, Philemon 1:2. The membership of the church was made up chiefly of Gentiles, 1:27, but no doubt many Jews were included.
Gnosticism were sown in the Christian church in the first century, A.D. but this heresy was not fully formulated and did not greatly threaten the Christian church until the second century, A.D. At the midpoint of the second century, almost all of the Christian churches had been affected and weakened by this heresy.
spirit is good and that matter is evil
How could God, made of spirit, create the universe, made of matter, and not contaminate Himself in doing so? (the Gnostic answer was that the universe was created, not by God, but by a being (“Jehovah”) far down the line in a long series of emanations (“aeons”) from God, each of which emanations was a little less divine, holy and pure than the preceding one),