Actually I believe that most people today do not libe under any such assumptions as to him being some kind of scandnavian looking deity.
Thinking that "they" all do etc would be the continuation or propogation of yet another negative stereotype about ones contemporary yet religious peers would it not?
What some think the Christian God looked like when he walked among us:
http://www.religioustolerance.org/chr_jcfa.htm
The Bible never gives any physical description of Christ. The closest thing we get to a description is in Isaiah 53:2b, “He had no beauty or majesty to attract us to Him, nothing in His appearance that we should desire Him.” All this tells us is that Jesus’ appearance was just like any other man's – He was ordinary-looking. Isaiah was here prophesying that the coming suffering Servant would arise in lowly conditions and wear none of the usual emblems of royalty, making His true identity visible only to the discerning eye of faith.
Isaiah further describes the appearance of Christ as He would appear as He was being scourged prior to His crucifixion. “His appearance was so disfigured beyond that of any man and his form marred beyond human likeness” (Isaiah 52:14). These words describe the inhuman cruelty He suffered to the point that He no longer looked like a human being (Matthew 26:67; 27:30; John 19:3). His appearance was so awful that people looked at Him in astonishment.
Jesus was a Jew, so he likely had slightly darker skin dark eyes, and darker hair than most of his caucasian indo-european decended cousins from the colder latitudes. In other words he probabely looked just like all the other jews in his area at the time wchich means he was primaraily persian/phonecian in appearence.
This is a far cry from the blond-haired, blue-eyed, fair-skinned Jesus portrayed in many modern pictures or pictures derived from certian periods of westrn european art and just as far off from the artwork portraying him as african or oriental.
However:
One thing is clear: if it were important for us to know what He really did look like, Matthew, Peter and John, who spent three years with Him, would certainly be able to give and would have given an accurate description, as would His own brothers, James and Jude. Yet, these New Testament writers offer no details about His physical attributes.