This cartoon, which I saw on the Daily Kos, gets at the serious issues which the notion of an infinite multiverse raises for ethics and for religion. In an infinite number of universes, there will always be an infinite number of you and of me, some having done more good and some certainly having turned to evil, and any and all differences you can imagine. Eternal life becomes guaranteed, but not the victory of good over evil.
Infinity seems to make it inevitable that this is the way things are. And if there isn't an infinity of universes, that solves this issue, but raises others.