Carnifex is known for its brutal, aggressive sound and lyrics that focus on themes of violence and gore. They have incorporated references to demonic elements in some of their songs but this does not necessarily imply a satanic ideology or belief.
Anorexia Nervosa, on the other hand, has explored various dark themes in its music, but their artistic approach is more metaphorical and symbolic. They have used images of death and suffering to address sociopolitical and philosophical concepts rather than to promote any specific religious beliefs.
While it's true that some bands within the extreme metal genre have been linked to satanic ideologies or imagery, it's essential to evaluate each band individually and consider the context of their lyrics and artistic expressions. Simply using dark imagery or themes alone does not automatically make a band satanic.