@Sanoy:
So Luke did not know Matthew after all?
I think side 1 is correct and that explains why Matthew and Luke have different names in the genealogies.
You believe that Luke was fully aware of Matthew's genealogies. Why did he come up with a new genealogy? Do you believe that Luke wanted to show Mary's genealogy?
From the publisher of the NIV, Zondervan:
Why Are Jesus' Genealogies in Matthew and Luke… | Zondervan Academic
".....One problem with this suggestion is that throughout Luke’s birth narrative,
he stresses that Joseph is a descendant of David. He never mentions Mary’s Davidic descent. So, despite Luke’s emphasis on Mary in his birth narrative,
it would be surprising if his genealogy is Mary's."
Since that explanation is so problematic another two theories are presented on that web page.
I have no problem with side 1, I can't confirm or deny it because it is beyond my present life to achieve a firm position on that. So I won't dispute side 1, but side 1 is not mutually exclusive with Matthew being extant when Luke was writing his Gospel.
I don't
know that Luke was fully aware of Matthew, no one knows that, nor can we, but I think it is reasonable to believe that Luke would have looked into Matthew if available given his opening about other multiple gospels being in existence, his plan to investigate the matter, the cost of such a work, the purpose in such a work given that other gospels exists (IE, why is he doing another one? to fill in blanks?) and the need to establish both heritages given the unique birth.
What this quote from Zondervan amounts to is a an argument from silence. It's not a bad point, but it's not a strong point either. That is the problem with this whole field, we want to make a lot from it, but what we have is mostly all that is available to us. And one perspective is just a drop of water in an ocean of perspectives each with their own strengths and weaknesses. I have even heard good cases that Matthew is Marys genealogy and not Luke. It is for those reasons that I make the case that I do, that a nominal contradiction is defeated by a nominal exception. Because it is too difficult to find any definite ground because the whole subject is a sea of islands, each representing ones perspective. Searching for one, and standing on it, doesn't help when there are so many places one can stand. What matters is whether the case can be made for contradiction, because if there is an exception, the case for contradiction fails. And I think there are exceptions.
When it comes to historical subjects where there can be a multitude of positions one can stand on, each with strengths and weakness, what you stand on really amounts to what you bring into the question. What
you bring is the belief that Jesus's divinity is a myth. For
me, Jesus's unique birth demands both genealogies, it's a question that demands an answer for both parents whether by invention or reality. I have encountered the living Christ and His Spirit teaches me who He is in the scriptures. From my experience with God I expect God to establish Himself both through Joseph,
and Mary, whom God uniquely choose. I do no see Mary being left out of a purpose given her unique calling and virgin birth, either because of my trust in Christ to be a full part of our lives, or from the secular perspective - because it makes no sense to invent the virgin birth, which must have a narrative purpose, and then only give Josephs lineage. If the lineage is sufficient by Joseph, why invent the virgin birth? And if they invent the Virgin birth why not invent a genealogy that supports it rather than one that runs completely parallel to it? Each asks a question of the other that neither can answer. So now you know a little bit about why I come into this with the position I hold, both because of my relationship with the one in question, as well as secular logical reasons. I don't expect you to hold the former part of my reasons, my faith (trust), nor should you, just as I should not trust what you bring into the question, that Jesus is mytho-historical. So we are left with the text itself, and there seems to be no sustained claim to contradiction, and while "invention" may solve the question of whether you should consider Christ, it brings up more questions to the text than it answers.