Without a program capable of opening the .chl files to see the coding of Land 4, we can't find an escape from land 4 or a weak part of the script for you to take advantage of.
You can bypass lands 1-4 by starting a new game on the next land by:
IMPORTANT!
If you follow the next three steps, you will start a new game on Land 6, you will start with nothing not even a creature and to be honest I will have no idea what effect that my have on the programing so I do not recommend it.
Step 1:
Go to the folder
C:\Program Files\Lionhead Studios\Black & White 2\Scripts
Step 2:
Then open map.txt file
In the file you will find:
SET_LAND_NUMBER(1)
LOAD_FEATURE_SCRIPT(".\data\landscape\BW2\Land1.bwe")
change it to.
SET_LAND_NUMBER(6)
LOAD_FEATURE_SCRIPT(".\data\landscape\BW2\Land6.bwe")
(The reason you need to change it to "6" instead of "5" is because land 5 doesn't exists)
Step 3:
Start a new game.
So
Do what AppleApe said
"You have to takeover/impress the Norse village leader's main village."