From Life-After-RC combox comment:
It will be difficult to find a church/school in Atlanta that does not have at least a mild RC infestation (although it gets a little easier every day!) For schools, Queen of Angels/Blessed Trinity, Holy Redeemer, and Our Lady of the Assumption are all filled with enough Pinecrest refugees that you will be safe. St. Jude the Apostle never really bought into the whole LC/RC thing, but that school is particularly hard to get into. Pinecrest and Holy Spirit are RC schools.
LC got its foothold in the Atlanta area in All Saints parish and it remains a stronghold. Avoid St. Monica's in Duluth, Mary Our Queen in Norcross, St. Andrew's in Roswell, and St. Brendan's in Cumming.
Good luck to you and your family.