You're saying the pagans were mocking muslims and zoroastrians as idolaters? Forgive me but this seems like a strange claim especially with no evidence?

The pagans were siding and rooting for the Persian to win the Byzantine/Roman - Persian war since they considered the Persian similar to them in practising idolatory by the latter fire worship. When the Byzantine was in the losing streaks and at the brink of defeat, the pagans were mocking the Muslim at the time since they considered Byzantine similar to Muslim due the Abrahamic root with their practise of Cristianity (Nasrani). According to tradition Ishmael and his mother Hajar, the second wife of Abraham were migrated to a barren land (Mecca/Bakka) under God commandment. The event are recorded in both Quran and the Bible (Old Testament), and the Muslim yearly pilgrimage to Mecca is commemorating and reflecting this event. After the verses predicting the Byzantine/Roman victory were revealed, however the Byzantine finally overcome the Persian in a very short time within a few years [1]. Eventually, both Persian and Byzantine/Roman (two of the major superpowers at the time) were conquered by the rapidly expanding Muslim Empire, and the rest is history.

[1] Surah Ar-Rum:

https://quran.com/surah/ar-rum/info