Perhaps it would be usefull to refer to the understanding of Light.

Light means something holy, something Divine. The notion and the sense of holiness or the intrinsic profundity of light, and especially the Divine characteristics of Light, the ultimacy of Light,is a universal feeling-idea. It is part of all religions. It is part of secular life too. light is fundamental in human experience and aspiration and meaning (lighten up).

Dark and light contrasted has a kind of fundamental meaning for all people universally. Dark versus light; light versus dark. The idea of celebrating light rather than darkness is a way of universalizing a celebration at this time of the year in which all traditions can participate.

It would be useful for there to be a global public celebration that is about fundamental social unity, positiveness, and cooperation, without being exclusively associated with any particular existing tradition or traditions.

This celebration would be about acknowledging the universally tacitly understood characteristic of light, or non-separate radiance of positive being, in everybody one knows and meets. Everybody would of course freely use the essential symbols and meaning-elements of their own tradition while participating in this universal celebration. While, nevertheless, openly and entirely preserving the universal and non-separatist feeling of the celebration in the pluralistic social, and secular domain.

Such a celebration with its universal meaning, would include everybody and exclude no one. It could be celebrated in either a religious or non-religious manner, as individuals choose. While everyone always publicly, openly, and authentically actively manifests and participates in the fundamental virtues of universal social positiveness, universal inclusiveness, universal love, and the universal characteristic of Light.

The problem with your analogy is that the "multiculturalism" being imposed in the social world is not at all careful, slow and respectful.

It is not adding fruit to yoghurt, but attempting to mix 6000 different types of yoghurt together and still expecting it to taste good.
And doing so in a terrible hurry.

Expect our society to "throw up" any day now.