This particular topic most readily demonstrates the overlap between science and religion, and the reliance upon "faith" in "science", misplaced or not.
After spending *billions* (with a B) of dollars in search of exotic forms of matter, dozens of the most popular mathematical models have been falsified, and not a single shred of evidence suggests that any sort of "missing mass" in cosmology is in any way associated with exotic matter.
Since 2006, it's been demonstrated repeatedly that the baryonic mass estimation techniques that were used in the now infamous "proof" of dark matter paper were not worth the paper they were printed on. They miscounted entire *stars* in that flawed study by a whopping factor of between 3 and 20!
In the entire history of physics, never was more money spent on a supernatural snipe hunt, and after all that money spent, not a shred of empirical evidence supports the idea.
While some remain "faithful" to the belief in exotic forms of matter, all the "tests" run to date would demonstrate that it's a *misplaced* form of faith, "bad faith".
In terms of empirical physics, there isn't a "better" example of science relying upon pure "faith", "faith" that runs counter to the physical evidence in fact. How does any atheist justify trying to apply a purely empirical standard of evidence as it relates to the topic of God, when no such standard of evidence exists within "science".
In science, "faith" is common place, both misplaced faith, and justified faith that has later born empirical fruit. Faith isn't the dirty word that atheist seem to presume.
I can't even think of a better topic to demonstrate the blurred lines between science and religion. Of the four supernatural constructs of LCDM theory, only "dark matter" has the ability to be put to the test in so many ways, and it's come up empty every single time. If billions of dollars of failed so called "tests" of exotic matter theory won't falsify exotic matter claims, what will? If one can accept big bang theory on "faith" in the unseen in the lab, how then can anyone justify blaming a theist for living on faith with respect to the topic of God?