Paul was addressing Christians who were potential litigants in secular Roman courts: grown men suing grown men over broken contracts, theft, etc.
His point: a grown Christian man who has a grievance against another grown Christian man should settle matters within the church, with the implication that the church might excommunicate a Christian who wronged another Christian: a fate worse than paying restitution in a secular lawsuit.
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You are twisting Paul’s words to match your state of mind.
His point was that christians should not turn to a lesser authority than the kingdom, to the extent that it was manifest on Earth.
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