Since you have already declared that…
“I have been convinced in an intelligent creator for the universe, but always like to learn as much as I can on all sides of an issue.”
~ Roadfuzzz – http://answers.yahoo.com/question/index;_ylt=AgKYwaRFBmNRJ.APMMHaXonsy6IX;_ylv=3?qid=20120318202314AAn0Yus
…it isn’t clear that a scientific answer will be anything more than a mild curiosity to you. Science is about discovering ever deeper truths concerning the nature of reality, predicated upon the naturalistic interpretation of observations of nature, and experiments thereon. The ‘God did it’ answer, from whence the “intelligent creator” hypothesis arises, pre-supposes the actual existence of a fictional, supernatural, mythological character created by a bronze age Middle Eastern tribe (outside of its written tradition, within which any fictional character “exits”). Knowing the answer before you ask the question is antithetical to the whole scientific method, and especially so when the answer is predicated upon the god delusion.
Your question implies the following order of events:
1. Physicists discover that a number of universal physical constants appear to be fine-tuned for the existence of life.
2. The “intelligent creator” zealots pounce on this discovery with their bog standard “Ah-HA! God did it!!!” answer.
3. Atheistic physicists run scared, and out of nowhere cook up the godless Multiple Universe Theory as “a convenient way of explaining away the astronomical odds (pun intended) against a finely tuned universe”.
Nothing could be further from the truth.
All it would have taken to answer you own question would have been for you to read the whole articles at Wikipedia from which the unattributed quotes in your question are taken:
“The term [multiverse] was coined in 1895 by the American philosopher and psychologist William James.
1 Multiverse hypotheses in physics
1.1 Tegmark's classification
1.1.1 Level I: Beyond our cosmological horizon
1.1.2 Level II: Universes with different physical constants
1.1.3 Level III: Many-worlds interpretation of quantum mechanics
1.1.4 Level IV: Ultimate Ensemble
1.2 Cyclic theories
1.4 Anthropic principle”
~ Wikipedians, from ‘Multiverse’
In 1913, the chemist Lawrence Joseph Henderson (1878–1942) wrote ‘The Fitness of the Environment’, one of the first books to explore concepts of fine tuning in the Universe. Henderson discusses the importance of water and the environment with respect to living things, pointing out that life depends entirely on the very specific environmental conditions on Earth, especially with regard to the prevalence and properties of water.”
~ Wikipedians, from ‘Fine-tuned Universe’
So although the multiverse concept predates the fine-tuned universe proposition by ~2 decades, it’s fair to say that both have been developed in parallel by countless scientists over the preceding century – with little to no regard to input from the ‘God did it’ religionists. Note also that the one-size-fits-all ‘God did it’ non-answer stands in stark contrast to the wide variety of scientifically plausible multiverse hypotheses discussed in peer-reviewed science journals – resolving such uncertainties drives scientific discovery forwards, while simplistic ‘God did it’ certainty always tends to act as a break on scientific enquiry.
If you are genuinely interested in these multiverse hypotheses, I can highly recommend ‘The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos’ , wherein American theoretical physicist Brian Greene uses separate chapters to describe nine different current multiverse scenarios in some detail, for non-technical educated laypeople like us. How each scenario distinguishes one universe from another varies from hypothesis to hypothesis.
Hope that’s broadened your understanding, and given you some pointers for further exploration,
Reason Love Science Logic – ∰ ♥ ♳ ⨁
 ‘The Hidden Reality: Parallel Universes and the Deep Laws of the Cosmos’, by Brian Greene:
» about – http://en.wikipedia.org/wiki/The_Hidden_Reality:_Parallel_Universes_and_the_Deep_Laws_of_the_Cosmos
» Google books – http://books.google.co.uk/books?id=FDZYOo4C2MMC&dq=The+Hidden+Reality:+Parallel+Universes+and+the+Deep+Laws+of+the+Cosmos&source=gbs_navlinks_s
· 8 years ago