I would not. Just the opposite in fact which would be clear if you followed my link posted above to the reasons why I believe.
And as I also explained above the end of materialism was the discovery of science that everything including matter are just different forms of energy. So the atheists shifted from materialism to naturalism and thus you are beating a dead horse that died more than a century ago.
Thus the far more important point is that this mathematical description which science excels at is not the totality of reality. The atheists LOVE to cast religion into the role of primitive science and so last thing that you want to do is make it look like science has the better handle on the immaterial aspect of reality than religion does. SO it is not about the dead horse of the immaterial nature of reality but about the fact that there is more to reality than what the mathematical equations of physics describe.
Incorrect. It is a demonstrable fact of neuroscience that it most certainly can. Light, math, social values and other immaterial things the brain most certainly has adapted to apprehending them all. AND not only that but computers can do the mathematics even better than we do. If you want people to believe in the value of spirituality then the intellectual realm of mathematics is the completely in the wrong direction to point them in. That can only play into the hands of the naturalists.
Not entirely… Mostly to be sure. But the old hat that mathematics is the universal language is an assumption that we are beginning to have reasons to doubt. The answers are certainly objective but the subjective part is in the questions we choose ask. Thus it is entirely possible that an alien civilization out there may have asked very different questions to get something playing a similar role as mathematics does for us but which is totally different from ours.
Though… this is actually better for your implied attempt to connect math with spirituality. Because the objective has more to do with science/physicality and I think it is rather demonstrable that subjectivity is an inherent part of spirituality.