Equating 'reason' with rationality, thence objectivity, thence universality was a fundamental error in the 'Enlightenment Project'. No product of reasoning from an immaterial truth as a starting point, whether sacral/theological(/mystical) or secular/ideological, can be rational, given that starting point. So no ideology--to include Liberalism (the first ideology, and the one associated with that Project))--is any more rational than any theology is.

A need for governance is a reality that our human propensity to live together in groups imposes upon us. An approach to governance following, rather, from a universally observable fact of (perceived) material existence would actually create more space for spirituality, as it would not involve immateriality in any form in the governance of society. Using any immaterial truth for governing the governance of society necessarily marginalizes all others relative to that one privileged truth.

Even worse, there are no inherent bounds to the potential reach of any immaterial truth. That is the source of the tendency towards 'totalizing' that Critical Theory identified with any ideology (or theology). An approach to just governance that is wholly contained within material existence (as we humans perceive we experience it) is self-limiting.

If curious: "Can't Get Any Simpler" is a "3 min read" here in Medium with links to more articles about that topic (with nothing I publish here behind the paywall--since the pennies I would expect to earn would make no actual difference for me, anyway).