How Exactly to Make Sense of Co-existence of Natural and Spiritual Realms?

Suppose we define the natural realm to consist of whatever is naturally occurring in nature, and whatever is created by man. We have then that the natural realm consists of man, woman, animals, vegetation, fruits, fish, birds, buildings, cars, computers etc.

Suppose we define the spiritual realm to consist of God and God’s enemies. We have then that the spiritual realm consists of God, God’s helpers such as angels, and God’s enemies, whom we conveniently can refer to as the devil and fallen angels who owe allegiance to the devil.

If the spiritual realm exists as an end in of itself, the spiritual realm does not generate any reality within the natural realm. We have then that God created man and everything else, put natural laws in motion, then left man to himself and herself. Within this rubric, God cannot be blamed for suffering on earth. Mankind’s evil tendencies cannot be blamed on either of God or the devil. The earth simply is whatever mankind makes of it. God is not capricious, the devil does not tempt. God and the devil duke it out in the realm of the spiritual without any consequences whatsoever for all of mankind.

But what then is purpose of creating without caring whatsoever what happens to your creation? What exactly is purpose of opposing God if it does…