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:
Just a word of warning the lands get harder as you progress.
Land 4 is the final TUTORIAL land.
The easy way to beat the land is just sit behind the walls an build.
Fields in the fertile areas.
Housing and Leisure buildings in the impressive areas.
Industrial and storage in between.
Military if you use them anywhere out of the way.
One thing that many people miss when starting with B&W2 is that each building has it's own circle of influence for good or bad.
This info should be enough without spoiling your game.