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In page Christian countercult movement:

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Christians have applied theological criteria to assess the teachings of non-orthodox movements throughout church history.[1][2][3] The Apostles themselves were involved in challenging the doctrines and claims of various teachers. The Apostle Paul wrote an entire epistle, Galatians, antagonistic to the teachings of a Jewish sect that claimed adherence to the teachings of both Jesus and Moses (cf. Acts 15 and Gal. 1:6–10). The First Epistle of John is devoted to countering early proto-Gnostic cults that had arisen in the first century CE, all claiming to be Christian (1 John 2:19).[citation needed]