Was the church in Colossae mostly Gentile?
Yes, the church in Colossae was mostly Gentile. It was situated in Gentile territory, so it was probably a congregation of predominantly Gentiles. Although nearly all such congregations had some believing Jews among them, the majority in Colossae were Gentile believers.
Les explains that Colossae was located in Gentile territory, so it was probably a congregation made up mostly of Gentiles. He notes that almost all these congregations had some believing Jews, but they were predominantly Gentile. Paul always writes to the believer, and in Colossians 2:13 he addresses them as those who were dead in sins and the uncircumcision of the flesh, that is, old Adam, but have been quickened together with Christ. Les also connects verse 14 to the blotting out of the handwriting of ordinances, which he identifies as the law, with its severity and inability to be kept.