Based on research, here is some of what I have discovered about the NT gospels.
Just because the Christian community believes the NT gospels doesn't mean they are accurate. Here are some important references. The Missing Gospels by Darrell L. Bock, PH.D., The Lost Gospel Q by Burton L. Mack. The book by Mack is the most important. Using a brilliant analysis supported by the world's foremost biblical scholars, Mack traces the time line for the Jesus movement, documenting when Jesus movement leaders changed the Jesus narrative from Jesus a wise man to Jesus the son of God. If you reject his analysis, you must present a cogent argument.
There is no historical evidence for Joseph and Mary. What you find are what early church leaders wrote without historic affirmation. They, like NT authors, made up stories. Again, if you do serious research, you'll find prior gospels conflicting with NT gospels. Mostly, you don't find Jesus stories (narratives) in prior gospels.
Everyone should read Jesus Before The Gospels by Bart D. Ehrman. It explains how the four gospels evolved, from rumors and storytelling to gospel writing. None of the gospel authors were eyewitnesses, knew eyewitnesses, where Jewish, lived near Galilee where Jesus preached, spoke Hebrew, wrote Hebrew, or had known a follower of Jesus. Yet, they wrote as if they knew Jesus and all of his disciples. Ehrman's book is an excellent presentation of academic studies from psychology, anthropology, and sociology about memory, nature of group memories, and oral traditions. The four gospels were written (first by Mark and ending with John) from about 65 to 110 C.E. by men who gathered information from earlier gospels, rumors, oral traditions, and local Christian groups, not from eyewitnesses or other firsthand sources. By the time stories got to them, facts, and, most notably, narratives about Jesus had changed in so many different ways as to seriously question the real story about Jesus.