... is that they won't ever quit bringing up God in everything they do.
Now I have nothing against atheists, just as I would have no issue with Flat-Earthers, but simply taking the religious position they do doesn't grant them any sort of moral or ethical superiority. I point out that having a religion does not require a Supreme Being or Deity. Buddhism is the largest such example, with between 350-550 million followers. (The beings known as "Devas" or "Brahmas" are not deities as such, but merely those reborn into the highest planes of existence, having necessarily passed through humanity at some point.)
Now we have atheists sitting around, singing songs that support their religious beliefs in a crowd of their coreligionists, and taking moments of quiet contemplation to begin and end their religious convocations. If it looks like a church, sounds like a church, and talks like a church, it's a church.
My only question is what religious symbol they have atop the spire? And whether they will have the chutzpah to demand tax-exempt status given to churches.