St. Michael
Why is the archangel Michael referred to as "Saint Michael" in our writings and hymns?
Your question is very appropriate and understandable. The Christian Church has called the archangel Michael “Saint Michael” or “St. Michael” for centuries.
A saint is someone who is holy in the sight of God (Romans 1:7; 1 Corinthians 1:2). Since the Bible speaks of holy angels (Mark 8:38; Jude 14; Revelation 14:10), “saint” is a word that can be attributed to them. (Not all the angels remained holy – 2 Peter 2:4.)
The minor festival of St. Michael and All Angels provides Christians with an opportunity to praise God for using his holy angels to protect them (Hebrews 1:14).