How does a hajj unify people of faith

 Best   They gave them 5 central practices to abide no matter their differences else where. 

Every Muslim pronounces the Kalima Shahadaa as every Muslim believes in one God and Muhammad (saw) as His messenger. 

Every Muslim prays to God in Salat and believes in the blessings of congregational prayer. 

Every Muslim believes in paying Alms and Zakat if they are able. 

Every Muslim fasts in the month of Ramadhan to remember Allah and sympathize with the needy. 

Every Muslim believes in having to do the Hajj at least once in a life time b/c at Hajj, every single person is on equal footing in dress, food, living, and so forth. 

I hope that addresses your question.

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