If you read the Bible with an open mind , it appears that Jesus is the son of a human (Mary) and "God"/"Holy spirit", i.e. a hybrid. This means that this "God" must be genetically similar enough to humans to breed with us which makes the Nordics the most likely suspect. The aliens of the Bible look so much like humans that humans can't tell the difference (the angels/aliens who visit Lot are assumed to be "men").

Slightly off-topic: While I was looking through Matthew I discovered that Matthew starts with showing how Joseph is a descendent of some pretty important people in the Old Testament. Why does that matter seeing that Joseph is not Jesus biological father? Joseph is a descendent of king David, not Jesus. They also state that Joseph "knew her not" until Jesus was born. How would anyone know that? Interesting.

The passage I was looking for is:
Mat1:18 Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.

No detail as to how they came to that conclusion. I derive from there that she was either impregnated by an alien directly or they used artificial insemination.

There is also:
Luke1:27 To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin's name was Mary.
Luke1:28 And the angel came in unto her, and said, Hail, thou that art highly favoured, the Lord is with thee: blessed art thou among women.