"Rudolf Steiner claiming to see undines in a room that's painted blue as normal Christianity has to do with the idea of worshipping a polytheistic sun god who promotes that children shouldn't be taught academic subjects because maturing their intellect cuts them off from the spirit realm."
The sun god may have been to specific for our liking but it's easy to find "faults" in science and education (it seems that they are two sides of the same coin).
Have you checked out Lyndon LaRouche? Could be seen as another anti-cult cultist who was apparently also a political figure. He was publishing the EIR and
there was once an article about how "new age" education (mentions the 'human potentialities movement' fwiw) is being set up. All that with a super punchy title.