Salam,
We should be warned of him and his deviant creed. Nuh Ha Mim Keller mentions in his Tariqa Notes that sacred dance is one of the rituals of the Shadhili order. According to him, the sacred dance is a type of dancing performed by Sufis in unison while they make Dhikr (remembrance of Allah).
Laa Howla wa Laa Quwwata Illa Billaah
For more info look up the following links.
http://www.allaahuakbar.net/individual_cal..._nuh_ha_mim.htm
http://www.allaahuakbar.net/individual_cal...and_dancing.htm