From a recent study of Psalms and Genesis, I see the divine entourage, starting with, "Let us make man in our image." And then in Ps. 82 - where the RC bishops' version of the Bible (NABRE) backs me up that this is the divine council - we see the harm caused by angelic "rebels" whom we later see in St. Paul, Ephesians ch. 6, the principalities and powers. There is a great deal of biblical support for this "unseen realm." Satan and his corp normally work as wolves in sheep's clothing ("unseen"), such as with the priests who are for the Constitutional right to gay marriage or who don't believe in the resurrection of Jesus, or with church leaders banning the Hail Mary and the St. Michael prayer from post-Mass prayers. But now we see the devil working out in the open, in the U.S. with law court attacks on the faith, and way more horribly in AFG where believers are being burned alive for their faith as we speak. I believe that we should keep an open mind, that in days like these Jesus may well return to the earth, as promised, and if he does the Book of Acts says that we will see him on the Mount of Olives. It's important to look to him and for him daily (the worship of the Lord); otherwise, I might miss him.
"That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon and touched with our hands, concerning the word of life -- the life was made manifest, and we saw it, and testify to it ...." I John 1:1-2 (RSV)
"After his resurrection the disciples saw the living Christ, whom they knew to have died, with the eyes of faith (oculata fide)." Thomas Aquinas, Summa Theologica, III, 55, 2 ad 1, as quoted in D. M. Stanley, Jesus in Gethsemane (New York, Paulist Press 1980).