That must be why its most holy sites are originally sites -at least those not appropriated from Jews after Muhammad got to Yathrib- belonging to pagan Arabs, why its chief god was originally and really a pagan Arab god, why so many of its rites (Hajj, for example) are originally rites belonging to pagan Arabs, why its language is one of pagan Arabs, why the shit it describes as good (pretty much its description of Heaven) is something pagan Arabs living in a desert 1400 years ago would find cool, etc. etc.
It was totally not designed for pagan Arabs and Arabic culture.