The Temple of Bastet wanted to believe that the words that Adrian spewed but they do not have any record of a fragment of Apophis sealed within the depths of the Thorny Pit. Adrian already knew that this would happen because the Sun God Ra had told them that there were no records to make sure that no one tampers with the Thorny Pit.
The Thorny Pit was meant to be a secret sealing site to make sure that the fragment of Apophis does not get released by human hands. It is a good security implementation but a double-edged sword if something like the situation they are in now is happening. Since the two knew that they would not be believed by mere words, Cairo took out the token that the Sun God Ra has given him.