In the New Testament the books of Luke and Acts were written by the same person, Luke, a greek-educated physician. His style of greek shows that he was quite educated, and from Acts we can have an idea of what town Luke was from, and know that he followed the apostle Paul around for most of his life.
Luke knew what he was writing, for he tells us in the first four verses of his gospel that others had written some accounts of what happened in the New Testament church, and he had investigated everything carefully and put it down in order. The New American Standard translation gives the nuances of the meaning of these verses.
The book of Luke gives us an account that was written by a very educated man, who spent a great deal of time interviewing eyewitnesses and documenting historical accounts. Have you read the first two verses of chapter three of this book? Have you read the genealogy in the beginning of this book? Have you noticed that the first verses of the book claim that the information came from eyewitnesses, and how many times Luke makes references to the individuals who gave him the information? Peter later writes his books of the New Testament, and in them state that the things that they were recording were not “cleverly devised fables” but were eyewitness testamony.
C. S. Lewis was a scholar who taught literature at Cambridge. He staked his professional reputation on the fact that the gospel accounts and Acts just don’t read like the other mythical literature of the day. Indeed, Luke seems to have invented a style of historical writing which was not commonly practiced in those days.
I urge you to read Luke and Acts while realizing that they are accurate history. These books make claims which are different than any other in history.