Church of Christ error against Eternal Security
The Church of Christ, also known in some circles as the Campbellites (after Thomas and Alexander Campbell), have repeatedly preached heretically that Christians can lose their salvation. They look to Hebrews 6 to justify their position against eternal security. This is not only unscriptural, but also utter nonsense. In contrast, much of Paul's Epistle to the Romans unwittingly shames the Campbellites in their temporal security heresy. Also, if they took a closer look at Hebrews 6, Paul said what he said for the sake of argument. He knew that the Jewish converts to Christianity would not abandon the Faith. Rather, he was giving them a message of hope AND eternal security.
The Campbellites have long maintained that they oppose the Doctrines of Grace. This is just a glaring example of their offense against the Gospel.