Michael,

I think the problematic belief system is not just "materialism" but rather "reductionistic materialism". A good example of that would be someone who is certain that all phenomena in the universe are simply an outcome of the Schrodinger Equation. The kinds of evidence that I feel are incompatible with reductionistic materialism include spontaneous precognition, spontaneous telepathy, controlled laboratory studies showing these effects, triple-blind mediumship studies, etc.

The truth-seeking approach is to allow observations and data to evaluate the strengths and weaknesses of our models. Much more commonplace is that we use our models to filter the observations and data we are willing to accept. And that is especially prevalent among adherents to the dominant paradigms of any particular age.