> This is true, but also underlines the very point the article was making. In the United States, Christianity is the default. Characters are typically only identified if the stray from the default

But Christianity isn’t the default, secular is the default. When there are identifiably Christian characters, they are often some cringey stereotype (the religious clique in “Easy A”, for example). See also the link about “Hollywood’s religion problem” for many more examples. Hollywood clearly, starkly distinguishes between “normal” characters and “Christian” characters.

> Furthermore, given the sheer imbalance of identities in the country, it’s a disingenuous to claim that say Batman is equally likely to be Zoroastrian, because he’s not explicitly stated not to be.

Right, because that would be unjust. Justice demands proportional representation, and you can’t have proportional representation and equal representation. If I create a cult tomorrow I shouldn’t have the same representation as Atheists or Hindus, who constitute a much larger share of the country.