The observer effect clearly demonstrates that, in order for anything to actually happen, there must be an observer. As things actually happened prior to our existence, who was this observer? In other words, quantum physics is dependent upon there being no mind-independent reality. This is one reason why H. L. Mencken, for example, considered physicists to be modern day witch doctors.
The observer effect doesn't postulate that nothing happens without observation, merely that observation alters any perceived outcomes. With no observer, things would still happen, but without the quantum effects of the observer's presence.
What, for you, is the key difference in credibility between the Christian miracles that you have been discussing this whole time, apparently happening with no clear element of human will, and the practices of shamanism (which you insist on referring to derogatorily) found in numerous cultures, in which it is the power of human interaction with the sphere of the spiritual that creates results as well as the value of performance and self-expression, or in the interaction of science with the forces of creation in such a manner? I find the latter two to be far more interesting and philosophically sound means of realization, personally. Why would the latent power of forces beyond us intercede on our behalf without some sort of manipulation and fundamental understanding of the workings thereof? Why is the idea of "there being no mind-independent reality" incompatible to you with the acknowledgement of the presence of spiritual force of which we as a species occupy a part?