It can have a secular purpose and have a relationship to God because God was presumed to be both over the state and the church and separation of church and state was never meant to separate God from government.
All human language draws its nature and value from the fact that it both comes from the Word of God and is chosen by God to manifest himself. But this relationship is secret and incomprehensible beyond the bounds of reason and analysis.
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The relationship of black Americans to Obama is sociologically riveting.