Tricky
Briefly immortal
The goal of almost all charities is to not only do good things, but to encourage others to help them. Any charity which openly advertises themselves as atheist is unlikely to garner much assistance from the general populace, thanks to the calumny that has been leveled at them for so many years.In view of what I sense is a rather unsavory reputation the appellation "atheist" carries, it's too bad they choose to hide their good works from public acclaim.
I sometimes help Christian charities, in fact, I did a stint at a self-labeled Christian homeless shelter just a couple of weeks ago. I cannot imagine any Christian helping out at a self-labeled atheist homeless shelter, but they might if the shelter said nothing about their affiliation.