Theological controversies over the centuries have sometimes been treated as if they were really important even though they were also often arcane. For instance, a trinitarian conflict split the Western and Eastern churches in 1054: Does the Holy Spirit proceed from the Father and the Son, or from the Father only? In the 1600s, “supralapsarianism” versus “infralapsarianism” almost divided the Reformed tradition. At issue was whether God decided to send a messiah (Jesus) before the first sin (because God knew it would happen) or only after it had happened (because only then was it necessary).
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