I understand both parts of your message. You may have forgotten I also have a Bachelor's focusing on NT studies, from a secular university. I just wish I knew why you are so closed to hearing more about the wonderful Bible.
Whether it be from a secular university or some “Christian” universities, the current NT scholarship, even among Christian scholars are that no one know who wrote these gospels, and while the gospel that are attributed to Mark, may be written the earliest somewhere in the 60s or 70s, this gospel never included any birth story of Jesus.
The gospels containing this episode about Jesus’ life, attributed to Matthew and Luke, but not actually written by these people, there is a consensus among most scholars that these two anonymous gospels were composed after Mark (attributed, not authorship) and between 80 and 95 CE.
It is highly unlikely those who wrote these 2 gospels were eyewitnesses to Mary’s pregnancy and Jesus’ birth.
The gospel that has been traditionally associated with Matthew, never disclosed the name of the 3 kings or magi, the so-called eyewitnesses to the star that led them from the east to baby Jesus.
And the gospel that has been traditionally associated with Luke being author, never named any of shepherds from Bethlehem, who supposedly eyewitnessed the host of angels.
For these 2 gospels with nameless eyewitnesses, how would the authors in the late 1st century tracked down and interviewed these witnesses from a time before Herod’s death in 4 BCE.
You talk of eyewitnesses, but you cannot account for any of their names, not even the names of gospel authors. How would you find these nameless eyewitnesses or that they were even alive to give testimonies of what they supposedly witnessed?
If you have studied of this regarding to the NT gospels, you would and should already know that the gospels were 2 to 3 generations after Jesus’ birth and Herod’s death, therefore tracking them down and writing what the eyewitnesses say they saw, would be nearly impossible.
And considering neither Matthew, nor Luke agreed with others in the tiny details, which conflicted with each other stories, the only thing they do agree with each other, is that Jesus was born in Bethlehem. The rest of the details seemed to be fabricated and invented by the nameless authors, including inventing the witnesses.