As Smith points out, the genealogy of liberal democracy demonstrates that liberalism is nothing less than the prodigal son of Christianity. Thus, it becomes plausible that Christianity has a continuing role to play in a liberal democracy. Smith might even be right that it is not so much common grace and natural law, but rather Christianity exclusively, on which liberal democracy is dependent. Constitutional lawyers and political scientists would indeed be well-advised to be more generous in integrating theological insights as well into their work in order to find this out for themselves.
Hans-Martien ten Napel, "Review Essay: Theological Medicine for Liberal Democracy," Journal of Markets & Morality 22, no. 1 (Spring 2019): 169-181.*
*Review essay of James K. A. Smith, Desiring the Kingdom: Worship, Worldview, and Cultural Formation, Cultural Liturgies, vol. 1 (Grand Rapids: Baker Academic, 2009); Imagining the Kingdom: How Worship Works, Cultural Liturgies, vol. 2 (Grand Rapids: Baker Academic, 2013); Awaiting the King: Reforming Public Theology, Cultural Liturgies, vol. 3 (Grand Rapids: Baker Academic, 2017).