It’s “dynamic” in that its numbers have been growing by leaps and bounds over the last 200 years or so, particularly in Europe and the Commonwealth countries, but now in the US as well.
And, to be more accurate, it’s Romanticism, as formulated and defined in the early 1800s: the four main beliefs being that feelings are more important than facts, civilization corrupts while primitive cultures are inherently pure, organized Christianity should be replaced by the worship of Nature (though Marxists replace this with the worship of economic justice), and beauty is defined by that which is bizarre, exotic, grotesque, and violent, rather than by that which is balanced, symmetrical, and centered.
That’s a pretty good description, historically relevant, and more helpful than wild diatribes against “modernism.” Wouldn’t you agree that the kick-off of the “religion” of leftism was the French Revolution? Romanticism, enlightenment, theosophy, naturalism, marxism, darwinism, secularism, deconstructionism, utopianism, etc, came to prominence differently in various cultures or systems, but they are all from the same ideology.