Non-Muslims are not allowed in Mecca because it is a holy sanctuary.
One has to qualify certain requirements to be there adding that Mosques or holy places are reserved for meditation and usually have basic requirements for entry. It further says that to keep the spirituality intact, non-Muslims are not allowed in this holy city
Additionally, the ban on non-Muslims is intended to give Muslim adherents a haven of tranquilly and protect the sacred city’s sanctity. Non-Muslims and tourists would just increase the traffic and take away from the holiness of the pilgrimage visit if they were allowed to enter the city.
It also implies that if they are not purified in accordance with Islamic law, even Muslims are forbidden. It is therefore assumed that followers of other faiths are uninformed of these regulations and are not cleaned before entering the city.
Non-Muslims are even prohibited from passing through Mecca, and attempting to do so might result in fines or expulsion from Saudi Arabia.
The Quran mentions the prohibition against non-Muslim guests as follows:
“Oh you who believe! Since idolaters are truly dirty, they shouldn’t approach the Sacred Mosque after this year. (Quran – 9:28) This fundamental idea underlies the prohibition against letting anyone who is “not clean” enter a mosque, whether they are Muslims or not.
