Not an atheist. We will take an assumption that time is like set of real numbers (not quantified), there exist every universe that is likely to happened (i.e. there exist 2 universes after we drop a coin) and in every moment one coin is dropped.

Now lets say we begin with only one universe. So question here is how many universe we have after 1 unit of time? Hence there are 2 outcomes and we have continuum (cardinality of real numbers) coin flips the answer is 2^continuum (cardinality of all functions from real to {0,1} or real numbers). If we indeed have that many universes (or experiments) we can safely say that fine tuning is bound to happened (to be more precise any normed measure (probability) which is invariant by translation (like uniform probability) or at least is similar (prob of set is 0 iff measure is 0) (that is kind of annoying, I get it "normal probability", not some perverted probability) measures our set of all fined tuned universe as 1=100%. Not bound to happened but it's called almost certainly)

Since we are here we can ask: "if this multiverse theory isn't true and we follow only one path how can we ask "what if?"?" and "how can we remember only one universe and have ability to choose our path in this multiverse mess?". My guess is that this is our freedom.

How many different version of human being? 2^C. Any sane mathematician (if that person even exist) would say that what is describable is definable by finite amount of axioms. Hence set of all axioms are countable we can use diagonal technique to prove that there is only countable definable objects. But if we allow any sub-set of set of all axioms (including those who have countable cardinality) to be description we would only reach C. So here lies greatness in our potential diversity and undescribability (I call last one soul).

In that chaos or darkness of unknown lies something always new and fresh (now you know what religion am I).

But of course if we agree that number of universes made from one in one second is 2^C and we want half second to differ we would say that there are sqrt(2^C) universes implying uses of surreal numbers.

Source(s):
Math, thoughts on Schrodinger cat and multiverse