The other BSA discrimination

In recent years, the Boy Scouts of America has liberalized its views on LGBTQ people and women. In reading this informative piece comparing the Boy Scouts and the Girl Scouts, one sentence reminded me of a long overlooked aspect of the BSA:

Boy Scouts of America did not lift its ban on openly gay scouts until 2013, openly gay scout leaders until 2015, and transgender boys until earlier this year. BSA still bans atheists.

Emphasis mine.

I am not religious. I do not think that discrimination against atheists is similar to a Jewish person experiencing anti-semitism or a Muslim facing Islamophobia. But still, this seems a bit archaic, no?