There is only science. The differing branches are called by different names. Those who are doing science with the belief that the Creation Narrative is true do so within the scientific model or at least they should.
What predictions have they made? What scientific theories have they proposed and what have they validated? Did they predict anything existing theories did not? There is simply no evidence that creation science exists in any meaningful way.
I don't think there was a question about evolution in the discussion, as far as whether evolution is factual or not.
The thread is about evolution, is it not? Unlike the (non)existence of multiple universes, evolution is something we can actually test, falsify, measure, and usefully use to make predictions. It is eminently reasonable and always related back to the real world.
The fine tuning discussion is silly and an example of the problems with unfalsifiable hypotheses. The chief issue is that it is confusing our present model of the universe (which has particular constants that look "fine tuned," though exactly
how a constant can be tuned at all, or how we can determine whether the tuning is "fine" without knowing the range of possible values, is a question I have yet to see answered satisfactorily) with the universe itself. Our model may only approximately describe our universe, and if it
can be described by a mathematical model at all, I am pretty sure it could provably be represented by a model that made entirely equivalent predictions but did not have any constants that
looked fine tuned (there may be some tricky model theoretic proof that you cannot do this but I have not seen one). Who says there's a rule that the laws of physics "have" to be described with simple mathematical laws? Many biological processes (and all of the ones we know about take place in
this universe) can't be easily described with simple mathematical laws. Under certain "eventually consistent Turing Machine" models of the universe, it would appear that the real fortuity is that our model is so "easy" to calculate (especially at the limit in Newton's Laws)--but that's not necessary for life, just for rapid technological progress. And maybe even that assumption falls apart if you can use the underlying laws of the universe to compute things (which is
sort of what quantum computers are trying to do).
In short--it's the same problem that Pascal's Wager has. People who argue for fine tuning (or against fine tuning and for the multiverse, who are guilty of the same problematic assumption) think they are on safer ground because they have science, and numbers, on their side, and allow for infinite possibilities--but in fact they, like Pascal, are guilty of considering almost none of the universes that we could model mathematically ("almost none" in the rigorous, well-defined sense of "the probability at the limit that an arbitrary system of mathematical laws fits the criteria for what a universe must look like according to them is 0"). Effectively, they might as well posit two--their argument has exactly the same problems. Or (even better) just posit one, the one we can actually observe.