Why do you say "Surely" here? Is it incomprehensible to you that Luke did what all historians and investigative journalists do, nothing more?
That's according to your carnal interpretation and representation, so let GOD be the truth and man a liar.
Your saying Luke did all the work on his own effort and strength, and authored the Gospel according to Luke?
i disagree, period.
I don't see what his being born again adds to the mix.
Because those who are not born again or truly born again, the god of this world the devil, have blinded their minds.
They will 'see' and 'see' but they cannot 'see', they will 'hear' and 'hear' and they cannot 'hear'.
The way non believers and believers witness things pertaining to the Kingdom of GOD, differ entirely.
Do a comparison between Luke and the other non believer historians' work in regarding Jesus alone.
The similarity you may find are what seen only on the surface about Jesus.
But in regards 'insight' to what is deep about Jesus and Kingdom of GOD, Luke excel way 'spiritual' than them 'carnal'.
Since he's born again of water and of the the Holy Ghost, able to 'see' and 'enter' the Kingdom of GOD.
There are lots of born again historians and writers (I know a few personally); would you give their writings the same credit as Luke's writings?
Same credit of what?
Tell your believed writers equal to Luke, not to refer to the Holy Bible and accounts.
Therefore, tell them to research on their own and have a Gospel written on their own.
Apparently, your writers only know to take, copy and paste, the writings of others, whether one's spiritual or carnal.
Thus interpret their own version and claim it as theirs for the money.
And what do you mean by "witnessing journalist" here? Luke did not personally witness a single thing reported in his gospel.
Sadly you're 'shortsighted', surely journalist witness the accounts of others or things, before they report it in the news.
Luke personally witnessed the testimonies' of the Apostles and church in regards the Gospel.
And compiled them as his witnessed Gospel based on the testimonies of saints during Christ and after Christ.
Luke was a believer himself and have close fellowship to the time and ministry of Paul and believers.
Nevertheless, he was also close in likewise witnessing the testimonies of the Apostles and believers during Christ, who are still alive.
You think that Luke was not inspired by GOD through the Holy Ghost, even to sequentially compile these accounts?
Folly!
For Jesus said,
"Abide in Me and My words, for without Me you can do 'nothing'."
Peace be with you in Jesus name