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

[Amarok]

You can get a brief overview here: https://en.wikipedia.org/wiki/Fine-tuned...e#Examples

Regarding your question about why so fragile. Life is extremely complex in its requirements. It is not clear why we should expect the right combination of elements, heat, gravity, radiation, and self-contained planetary feedback loops to be a common occurrence.

Even if the allowable ranges of the values of constants that lead to a universe with structure (atoms, stars etc.) is very small, the fact that these constants need to have very specific values does not make it unlikely for them to have these values. You are ascribing a low probability to the universe having its specific constants without justification. It may be that certain values of constants are more likely than others. Or, what if the range of possible constants for all possible universes is quite small to begin with? It's not necessarily true that the constants can range from minus to plus infinity.

The fine-tuning argument fails on the basis that it cannot establish the purported low probability of the universe acquiring its constants. For all we know the probability could be 1.

And indeed he has not proven that it's necessary for those ranges to be as they are only that they currently are . Also he over looks the fact of why the loops should not be common in as supposed life specific universe.