In “The Power of Heresy,” Rushdoony warns that false belief often proves more influential than faithful theology, using Marcion as a historic example of how heresy undermines the unity of Scripture, separating law from grace, creation from redemption, and the Old Testament from the New. Marcion’s rejection of God’s law, his reduction of God to love alone, and his implicit dualism paved the way for antinomianism, dispensationalism, and moral confusion—errors Rushdoony sees echoed in much of modern evangelicalism. When law is treated as evil or irrelevant, grace becomes sentimentalism, justice is denied, and atonement itself is emptied of meaning, leaving no coherent reason for holiness or obedience. Orthodoxy, by contrast, affirms one sovereign God, one unified Bible, and one redemptive purpose in which law and gospel, justice and love, creation and salvation are inseparable. The real question Rushdoony presses is stark and unavoidable: are today’s churches shaped by historic Christianity—or by a baptized form of Marcionism? #PowerOfHeresy #Marcionism #LawAndGospel #BiblicalUnity #AgainstAntinomianism #ChristianOrthodoxy #GodsLaw #Atonement #CreationalFaith

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