Theists: What is the most compelling argument you have heard for Atheism?

[Mister Agenda]

How did we get from your claiming that there is no debate that the physical constants can take on different values to this?  That the matter was not settled was my whole point.  You're simply agreeing with me.

I did some reading on M-theory. First, there is not one bit of physical evidence for it. Second, it posits as many as 10^500 different possible membranes (parallel universes) that could be right next to us. With that many universes--each with a different possibility of constants, it does not address the fine-tuning issue of why ours is the way it is. Third, it is not clear that whatever created the 'cosmic landscape' (multiverse?) would not have to have been finely tuned to create universes with laws and structure (kicking the can upstairs). Fourth, since it is very much in question whether the theory can ever be tested, isn't it just philosophy and not science?

How could a multiverse create a universe without laws and structure?

How would a near-infinite number of universes not address the issue of one having the values our has by chance? If you're literally asking why we're in the one that allows us to exist, you need to take a break.

It's theoretical physics, which would more properly be named 'hypothetical physics'. It has to fit what we already know and the math has to work, but it ain't necessarily so. It uses the scientific toolbox, and (hypothetically) the hypotheses generated may be possible to test someday.

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I really don't see how multiverse theory changes anything. As SteveII said, if you add up all the different "universes" into one totality that becomes the the universe. That new bigger universe still must be ordered in such a way to produce this "little" old universe. Also, it doesn't really help the skeptical cause to say everything can be explained naturally and then say there are other universes with alternative natures. Seems odd.

You seem disingenuous, so there's that. If a sewer spat out an unusually-colored lump, you could say it was fine tuned to that with your 'logic'.

Can you give an example of a universe that you would NOT consider fine-tuned?