If you did a poll on all exjws and asked them what they now believe I'd bet that the majority are athiest...
It's not "run by athiests"...its just many exjws come to the conclusion there is no god.
Most of us when a dub were told never to question things and now we do...so when someone comes on here and expresses their opinion or point of view that there is a god..well we question it...we ask about the evidence and we share the evidence we have found that brings us to our conclusion that there is no god and that evolution and abiogenesis is the "truth".
Most posters who are athiests are respectful to believers in a god but we still have the right to ask questions, ask for evidence and point out the major issues in believing in a god...and that is our right.
This is true not just on here but on every discussion on creation v evolution...believer v athiest.
If a believer chooses to pass by the reasons we express for being an athiest then that is there right...on here...I, like many others, will not belittle them for having beliefs...but I stress we may question and point out things that can be uncomfortable to a believer.
But this is not to in an argumentative way or to be critical...I find most athiest posters on here very respectful...and some are enthusiastic.