Is it the best possible universe, and if so by what criteria? (faith.org.uk)
Your argument holds true if, and only if, the current understanding of the universe holds true, and only if ours is the only possible universe. (religion.blogs.cnn.com)
This makes the number of possible universes much more manageable and testable, since it's no longer an effort to understand infinite universes that could have different underlying rules of physics and chemistry. (businessinsider.com)