What you describe, MorpheusSandman, is classical determinism where chance is based on ignorance of the deterministic forces. However, that determinism has been falsified through standard quantum mechanics. It has been replaced by uncertainty, not chance. I know you don't accept that it has been falsified, but I do and I have made my case in other posts.
I look at many worlds the way some might look on those who believe the earth is flat, or that the earth is less than 10,000 years old. These theories are interesting because they offer one a challenge to show why these views are wrong clarifying one's understanding of science. Other than that they have no value.
Let me suggest that you try to find a way to maintain an atheistic metaphysics in a consistent histories interpretation. At least then you won't be starting off opposed to modern science which can be used against your overall position.

