Biblically, those who deny Christ are typically non-Christians. We see this in a number of passages (Mt. 10:33; 2 Tim. 3:5; Titus 1:16; 2 Pet. 2:1; 1 Jn. 2:22-23; Jude 1:4). It’s possible that these were professing Christians, but they were not true Christians. Similarly, in this passage, Paul...