Hello, I enjoy thinking about this subject a lot. I am most attracted to the idea that we are all spiritual beings using these bodies to have experiences to learn and grow our consciousness. I don't think that the material and spiritual worlds are opposite and thats why they exist as you say, but more that the spiritual world came first, and created the "material" as it is a better learning environment for consciousness to learn as there are consequences to our actions here, whereas in an immaterial world, you could do or say anything and get little feedback as to whether that was a moral/good choice or not. A lot of us who have experienced moments of realisation and growth often find that they come in moments of deep distress or pain. Unfortunately, it seems that we "need" this feedback in the form or pain and discomfort in order to grow.