Even if atheism is defined only as lacking belief in gods, but that does not mean it tells us nothing else. If someone rejects the gods of Chinese folk religion, it is also reasonable to infer that they reject related beliefs such as ancestor spirits and gods receiving offerings, ghosts interacting with the living, spirit-medium communication, and rituals that influence supernatural beings. Will an atheist pray to a Catholic saint to intercede with God on the atheist’s behalf? Logically, atheism precludes belief that a saint will intercede with God. Do you expect an atheist to still believe saints exist, can hear prayers, and can influence events? Will an atheist burn joss paper so that an ancestor spirit will intercede with the gods in the Court of Heaven on the atheist’s behalf? Logically, atheism precludes belief that spirits intercede with gods in the Court of Heaven. Do you expect an athiest to still believe ancestor spirits exist, can receive offerings, and can influence events? Consider belief in the non-material aspects of circumcision and baptism. Some beliefs must necessarily be rejected if one rejects God or gods, and it is reasonable to assume rejection of at least some downstream beliefs.
~Max