"Holiness" has been useful for the religious, because of their need for identification "apart from the rest of the world". Therefore, the sects continue to separate from what is "unholy" to define and refine "who they are".
The problem with "holiness" is that it distinguishes one thing from another based on some "standardization". These standards are what religion is about. Standards of behavior in how to approach God, do one's duty, dress, perform, experience, and even think, etc. Religion is a false or pretentious "form" of judgement. These judgments are "justified" by texts, traditions, and "community norms".
What is really at stake is the individual's freedom to become apart from such religious "forms". Religion imposes itself on the natural world without allowing the individual freedom to question, and come to terms with their own "way of being in the world". Democracies allow such freedom. Apart from a free society there is no individuality.
Today's world is wrought with religious zeal that finds its identity in such "faith" apart from reason. And many find themselves under domination because of false convictions that are not really theirs. This imposition is really about co-dependence and "belonging", not healthy human flourishing and development. And co-dependence is about an under-developed ego.
At least that is my "unprofessional" assessment.
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