Most people like to point to the passages in Isaiah and Ezekiel to show Satan's fall, but these passages are not referring to Satan at all. If so, then he has already fallen in Genesis and in the garden and couldn't have fallen later in Isaiah and Ezekiel. Also, Satan was never an angel, he was and always will be a Serpent, a dragon. He is a completely different and unique creation from anything else. The passages in Isaiah are referring to a Cherub, no doubt, but they are not referring to Satan, The same holds true with the passages in Ezekiel. One final note I would like to make has to do with the word Lucifer. It is an improper translation. It should have been translated as "Howl," as the same word in Hebrew is translated elsewhere in the King James version. The word, "Lucifer," simply does not exist in the Hebrew language.
As always my friends, study to show yourself approved before God, and be ready and knowledgeable to have an answer to questions from inquiring minds.