Some Christian writers have applied the name "Lucifer" as used in the Book of Isaiah, and the motif of a heavenly being cast down to the earth, to Satan .New Testament War in Heaven theme of
Revelation 12 ( Revelation 12:7–9 ), in which the dragon "who is called the devil and Satan … was thrown down to the earth", was derived from the passage about the Babylonian king in Isaiah 14... interpreted such Old Testament passages as being about manifestations of the devil; but writing in Greek, not Latin, he did not identify the devil with the name "Lucifer".
Origen was not the first to interpret the Isaiah 14 passage as referring to the devil: twice presents as spoken by the devil the words of Isaiah 14:14 : "I will ascend above the tops of the clouds; I will make myself like the Most High". Though Tertullian was a speaker of the language in which the word "lucifer" was created, "Lucifer" is not among the numerous names and phrases he used to describe the devil. Even at the time of the Latin writer a contemporary of the composition of the Vulgate, "Lucifer" had not yet become a common name for the devil.
Some time later, the metaphor of the morning star that Isaiah 14:12 applied to a king of Babylon gave rise to the general use of the Latin word for "morning star", capitalized, as the original name of the devil before his fall from grace, linking Isaiah 14:12 with Luke 10 ( Luke 10:18 ) ("I saw Satan fall like lightning from heaven") and interpreting the passage in Isaiah as an allegory of Satan's fall from heaven.
However, the understanding of the morning star in Isaiah 14:12 as a metaphor referring to a king of Babylon continued also to exist among Christians. Theodoret of Cyrus wrote that Isaiah calls the king "morning star", not as being the star, but as having had the illusion of being it.The same understanding is shown in Christian translations of the passage, which in English generally use "morning star" rather than treating the word as a proper name, "Lucifer". So too in other languages, such as French,German,Portuguese and Spanish.Even the Vulgate text in Latin is printed with lower-case
lucifer (morning star), not upper-case Lucifer (proper name).John Calvin said: "The exposition of this passage, which some have given, as if it referred to Satan, has arisen from ignorance: ( lucifer before he falls and Satan after fall) for the context plainly shows these statements must be understood in reference to the king of the Babylonians.
Pls do ensure u read your bible slowly and repeatedly for Gods divine knowledge.