Customs and culture is are fundamentally different from worship from a fiqh standpoint . Worship is validated by submission, intention, method, adherence to the Quran, the sunna,.and the Islamic legal process and regulation. Customs and culture on the other hand are naturally validated unless the Quran and the sunna prohibits it.

Within Muslim society in the United States, there are numerous groups exist with different traditions.As in the rest of the world, the Sunni Muslims are in the majority. Shia Muslims, especially those in the Iranian immigrant community, are also active in community affairs.

Read more from following link....

http://www.quranreading.com/blog/islam-and-muslims/american-muslims-%E2%80%93-striving-hard-to-bridge-the-gap/ -

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