Why Jesus would have had brown skin.
Genetics drift in a geographical area when there is colonization, Empire building and migration. You can't look around at current demographics and draw conclusions about 2000 year old Jesus.
Light skinned Jews are light-skinned because non-first born Jewish sons left the Levant and went to European cities to build their fortunes. They took European wives when they got there. Most Ashkenazim descend from 4 founding European mother lineages. 80% of the X chromosome shown to come from European women while another 20 to 50% of the Y chromosome also cam from European men leading to the overall genetic make-up of Ashkenazim genes coming from 60-70% European people. (Meaning that the Ashkenazim right of return to Israel is a European genetic colonization of a land that's not Europe)
http://www.livescience.com/40247-ashkenazi-jews-have-european-genes.html
It's possible that 6 million were living in the Roman Empire about 70 AD while only 0.5 million were in the Levant, then maybe Jesus could have been light-skinned but if he was born and raised in the Levant and was very likely brown skinned. Jews were migrating into Europe during the classic society of the Greeks (Jews have Phoenician ancestry) and their spread into central Europe happened while the Roman Empire spread northwards during the time of the Roman occupation of the Levant.
Nevertheless, Goldstein noted that the new study “does offer better resolution of the [mitochondrial DNA] than earlier ones, and so the suggested interpretation could well be right.”http://www.the-scientist.com/?articles.view/articleNo/37821/title/Genetic-Roots-of-the-Ashkenazi-Jews/
How to create an atheist: read the bible twice cover to cover. share