They are different words for a reason. Function is what a thing does. Purpose is the intended reason for doing it. Tree branch has a function in supprting leaves etc but not a purpose. A branch carved into a baseball bat has a purpose. Purpose is always confered on an object by a conscious being. Unless you can think of an example where this is not the case?
You didn't answer my question, is the purpose of the heart to pump blood? Most people I think would agree that the purpose is to pump blood. The function is how that purpose is fulfilled.
We understand some of the laws of physics, we understand some of what might be required for life as we know it, we can speculate with incomplete models about what might happen if we changed the parameter's of our universe but it is all just speculation. You said you wanted to stay within this universe and look at the observed evidence. That evidence is 1 out of 1.
Probability Myth: we’ve observed X, so the probability of X is one
November 18, 2013 by
lukebarnes
Continuing with the probability theory, a quick myth-busting. I touched on
this last time, but it comes up often enough to deserve its own post. Recall that rationality requires us to calculate the probability of our theory of interest T given everything we know K. We saw that it is almost always useful to split up our knowledge into data D and background B. These are just labels. In practice, the important thing is that I can calculate the probabilities
of D
with B and T, so that I can calculate the terms in Bayes’ theorem,
Something to note: in this calculation, we assume that we know that D is true, and yet we are calculating the probability of D. For example, the likelihood
. The probability is not necessarily one. So do we know D or don’t we?!
The probability
is not simply “what do you reckon about D?”.
Jaynesconsiders the construction of a reasoning robot. You feed information in one slot and, upon request, out comes the probability of any statement you care to ask it about. These probabilities are
objective in the sense that any two correctly constructed robots should give the same answer, as should any perfectly rational agent. Probabilities are
subjective in the sense that they are relative to what information is fed in. There are no “raw” probabilities
. So the probability
asks: what probability would the robot assign to D if we fed in only T and B?
Thus, probabilities are
conditionals, and in particular the likelihood represents a counterfactual conditional: if all I knew were the background information B and the theory T, what would the probability of D be? These are exactly the questions that every maths textbook sets as exercises: given 10 tosses of a fair coin, what is the probability of exactly 8 heads? We can still ask these questions even after we’ve actually seen 8 heads in 10 coin tosses. It is not the case that the probability of some event is one once we’ve observed that event.
What
is true is that, if I’ve observed D, then the probability of D given everything I’ve observed is one. If you feed D into the reasoning robot, and then ask it for the probability of D, it will tell you that it is certain that D is true. Mathematically, p(D|D) = 1.
Excellent appeal to emotion, well done

Remember we are talking about likely or unlikely, about probabilities. From a probability perspective there is nothing more special about a life generating universe than a non life generating universe.
Emotion? I think of it more as logic. How logical is it to assume that a rock is as special as life when even one cell is so incredible.
Ok. Are you going to provide anything that shows he doesn't think the universe appears designed?