Jeanne believes she heard the voice of God, but based on how the Counter Force works as described in KnK, people infer she was probably being compelled by the CF. Not as a Guardian, but as a special human hero who can receive the CF during life.
As for your questions about gods, refer to: https://docs.google.com/document/pub...h.o8vz3dmvmkw6
The state of the Abrahamic god is left somewhat vague in TM. I think it is deliberate, to avoid controversy.