The bible never speaks to us as though we are disembodied spirits floating around in some celestial vacuum, but in the only way human beings can hear God's voice and recognize it as truth for themselves.
Groups of peoples worship in different styles and forms.
While we hope that the commonality of the blood of Jesus Christ would identify all groups, the fact remains that we do not worship in a vacuum, but our culture shapes and informs our religion. It is true that America is a melting pot. But as with any analogy, when take too far, it becomes trite in its definition. Immigrants and peoples of different cultures should not be required to shed the core and trimmings of their culture in order to share in the community of faith. There are countless examples of congregations that have become multicultural in their composition, and this is commendable.