nothing more to be said. there's your answer.Jesus was a descendant of David, and being from the middle east, he had more of a Arab or Indian skin tone.
He only been depicted as white because most artists at the time were euro-centric(hence blonde hair, blue eyes knock off). They just could not cope with the fact that Jesus did not look like them, and since these men created these images of Christ, many just openly accepted him as that way. I say it's brain wash, or sheer ignorance if you ask me.