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Protestantism was the primary religious affiliation represented by Kuyper's Anti-Revolutionary Party. This political party emerged during the late 19th century in the Netherlands, advocating for the integration of Christian principles and values into society and politics. Kuyper, the party's leader, emphasized the importance of religious beliefs in shaping social, educational, and political policies. The party aimed to uphold the moral and ethical foundations rooted in Protestant teachings within Dutch society.