Based on this passage, we can conclude that the Arabs were Muslims.
The Passage says that the Arabs were merchants who had a big trade empire and did things according to the Islamic rules.
It also goes to say that these Muslims made very good products and wares that were in high demand by other countries.
The Arabic Muslims also influenced the culture and traditions of other continents through trade. There was no separation of the Arabs from the Quran. They lived according to its tenets.
In conclusion, one can say that the Arabs were Muslims.
