First of all, angels are NOT dead people. Dead people are dead people. A study of Scripture shows that before God created man, He created spirit beings that He refers to as “morning stars” and “sons of God” (i.e., beings created by God) (Job 38:7). Led by Lucifer, a portion of those spirit beings went bad, and now those “evil spirits”/”unclean spirits”/”demons” are working with him to thwart God’s purposes and wreak havoc on mankind.
The majority of those spirit beings are the GOOD ANGELS referred to in Hebrews 1:14, which calls them “…ministering spirits sent to serve those who will inherit salvation.” Today, “those” are Christians. As per many biblical records (e.g., Acts 5:19, 8:26, 10:3ff, 12:7ff, 27:23), angels give us the Lord’s messages, guidance, direction, and protection. Given the raging spiritual battle in which we are the chief targets, this is a most reassuring truth.
For further study we recommend an audio teaching: “The Ministry of Angels to Christians.” We have several articles: “Angelic Warfare;” “Satan Started as a Star;” and “The Ultimate Treasure Hunt;” and “What Does the Bible Say about War?” We have video teachings: “What Are Angels and What Are They Doing?” and this next teaching shows what they are doing, “Keep the Faith.” We have a book which covers some on angels in Chapter 1: “The Gift of Holy Spirit: The Power To Be Like Christ.” We cover angels in parts of our booklet: “34 Reasons Why the Holy Spirit is not a Separate “Person” from the only True God, The Father.”