It is undeniable that some of what religions, spirituality etc termed it as 'miraculous healing' do infact happen. Faced with this fact, the so called scientists created a knwoledge like envelope to package ignorance and then termed it 'placebo effect'. The beleifs, knowledge etc, or in short, mind, is temporarily acknowledged that it can affect matter. However, what is under the bed is the fact that we don't yet understand the mind-matter interaction. Furthermore, if you try to use the premise that mind affect matter to underpin psi, alas they now deny that mind can affect matter!
But the 'placebo' dismisal is pointless because if beleifs etc can affect chemical/physical processes, then what is, for all relevant purposes, 'mirracels' can happen. This is for the simple fact that matter, together with forces of nature are spatialy extended. The mind can't affect matter without affecting EM forces. The forces in turn extend out of the body, even to the other person you are in contact with.