For 1, this is doubtful as a historical source from a non-Christian perspective. The Gospels accounts are surprisingly consistent, except for specific portions

For 1, this is doubtful as a historical source from a non-Christian perspective. The Gospels accounts are surprisingly consistent, except for specific portions that all conveniently bolster support for the idea that Christ is the Jewish messiah. The story about his birth is Bethlehem is a prime example (it’s more likely Jesus was born in Nazareth). I would question the ability to pinpoint a birth year through likely made up details.