Well, if you don't want to discuss cosmology, don't assert that science does not address the origin of the universe.
J. Budziszewski (Natural Law proponent, author of "Revenge of Conscience," "What You Can't Not Know," and tenured philosophy and law professor at UT Austin) comments on those infinite universes - he says that's an awful long way to go to explain what could be explained by believing in God. Primarily, he says the whole creator-less universe(s) teaching is designed (excuse me) by those who need to justify euthanasia -- (and I agree).