The best place to really get detailed answers about the Church of Satan
is from our published literature, especially The Satanic Bible
I am unaware of a specific Church policy with regard to the American Atheists organization.
Generally the Church openly offers official support for those organizations which endorse us
. I do not recall that this organization has done so. The door is open if they should make that decision.
I am aware of members of that group who are also Church members so there is no real compatibility problem.
You are either born a Satanist or not. If so you will find the Church highly attractive. If not, there remains the rest of the world to relate to.