On what basis? Schroedinger also rejected all the Abrahamic religions -- not on the basis of any sort of reasoning, but just because he didn't think so. He was a genius, of course. So was Einstein in Dirac and Pauli and Feynman. But you know, I wouldn't go to any of them for medical advice, or assistance with a serious legal problem. So why would I trust them with the issue of consciousness, either?Erwin Schrodinger, another founding father of quantum theory also hypothesized that consciousness is fundamental...
Erwin Schrödinger - Wikiquote
By the same token, I wouldn't ask Daniel Dennett or Michael Gazzaniga (great neuroscientists) or Christof Koch (best known for his work on the “neural bases of consciousness”) for help in understanding Quantum Theory (and I need a lot of help!).
And it is a fact that those who spend time actually studying brain, mind, consciousness and so forth are in general much more persuaded by consciousness to be correlated with brain, although there is no certain agreement on how, just yet.
And there is an amazingly large gap that any hypothesis that "consciousness is fundamental" must cross, and that is -- since it is supposed to be "fundamental" and therefore not physical -- there is no way anyone can understand how it can operate in a causative way to, for example, move my fingers to type this.