zazizoma - I could accuse you of sophistry, though I'm assuming you are, as you say, entirely sincere.
I went back to look at the website of the Cardiff Steiner Initiative and found this under principles It epitomizes the 2 sides of Steiner. The section on the left is... nonsense gained by clairvoyance and now fixed in doctrine and on the right is an example of Steiner the empiricist, who can sometimes be interesting.
Reading the section on the right I agree that there are potential biological mechanisms linking for example 'rote learning' to hardening of the arteries. However the evidence does not support this particular hypothesis. (There's a theme within scientific literature of investigating the link between emotion and heart disease which has generally not borne fruit though there is a statistical association between ischaemic heart disease and depression)
This is an example of how some of Steiner's observations concerning the emotional care of small children in education are reasonable: promoting resilience and developing confidence are the buzz words of MAINSTREAM early years' experience in the UK. 'Every child matters' is the core of Government policy. Nor is it impossible to find examples of early years' excellence on the model of a kindergarten in this country without ANY of the doctrines of karma, incarnation and the impossible-to-define 'spiritual' that quite openly pervades Waldorf Steiner schools, as evidenced by this link clearly made for the benefit of parents on the Cardiff Steiner Initiative site
Here is one very good example
If you want to jettison Steiner the mystic and are prepared to drop even Steiner the empiricist (contributing in a minor way in his time) you may be able to found a school with beginnings as good as the above. Then, we are no longer talking about Steiner at all.
As for the beliefs of teachers in schools: I like many people nowadays do not privilege 'belief' over political opinion. If a teacher in my dcs school was an active member of the British National Party I would need to know and would be concerned. Knowing all we now know about anthroposophy, we would be foolish not to feel a similar concern exposing our dcs to even the 'professional' anthroposophist.