Atheists' solution - untestable "science"
What scientific evidence exists to support the multiverse model? None! Not only is there no evidence, the physics of our own universe requires that we will never be able to obtain evidence about any other universe (even if it does exist). Therefore this belief is, and always will be, based solely upon blind faith (sounds like a new religion to me)! Why are some cosmologists "uncomfortable" with the idea that the cosmological constant (lambda) is so finely tuned? Simply because such fine tuning suggests design and (oh no!) a Designer. A hypothetical, untestable, complicated model of a super universe is the only alternative to belief in God. Such belief is not based upon science, since science requires that hypotheses be testable, but is based solely on the "hope" (i.e., belief) that there is no personal God to Whom we will be personally accountable.