This is my experience with the connection between the material realm and the spiritual realm. As it is said in the Kabbalah (Jewish spirituality) as above so below.
I have come to spirituality from a strictly scientific point of view. After all I am a Neoplatonist. So, I am a scientist. This has lead me to conclude some things on a strictly scientific base. There is a thing called g-d, we can prove it. I based this on a classical philosopher called Anaxagoras, the teacher of Plato. Or one of the teachers of Plato.
After that, I have observed this interaction. Anaxagoras say that we are g-d, because the splinter of intelligence we have in ourselves is g-d, g-d is intelligence.
So there is a link, and I believe that there are entities in the realm of G-d. Angels, demons and so on.
We can either serve one or the other.
They also fight a lot, the good guys against the bad guys. We are tools in their arsenal as much as they are tools in our arsenal.
This makes the ability of our shared religious fighters, be it a rabbi, priests of mullah, to fight against evil extremely important. Prayers, devotion and sacrifice helps. It feeds energy to our side.
So all this fighting against Satan it is important, because as above so below. The fight is real.
G-d bless the will to ally ourselves with our ideals; the angels.