[null and void]

What with all the talk of alternate dimensions and universes by scientists, why is it such a stumbling block to them that the physical laws of the unverse could have changed whe sin entered the world?

For the same reason the Big Bang theory and black holes so unpalatable to most of the scientific community.

They require that the rules be different, undefined, and/or undefinable.

[metmom]

IOW, the rules change and the scientific community cannot make any statements of absolutes that it likes to put forth with stunning regularly. Science then becomes a house of cards and everything scientists like to put their faith in evaporates and they are left defending smoke and mirriors.

On what scientific basis do scientists conclude the rules have NOT changed?

[BrandtMichaels]

uhh there is a rock you seem to be stuck under here.

The big bang theory is now the most widely accepted on origins as universal observations have eliminated all the competitors. Even a multi-verse universe still requires a beginning or beginnings...