There has always been a "mulititude of contradictory and fluctuating statements which emerge even within the same schools of theology."
Let's test your thesis. Neo-orthodoxy -- who is the true representative of it, Barth or Brunner? Is natural theology in or out?
Modern theology is built on the primacy of individual thought; there is no theology, just an assertion of the individual's right to theologise.
Heretics are no new thing.