Shirk

Islamic mortal sin, death-worthy crime, consisting in ascribing any partner to Allah but even atheism is shirk. In the Islamic Shahadah, in Q.48.8-9 (-Chr.111-) and 61.1 (-Chr.109-), Mohammed ascribed himself is as such a partner. His very name meaning The Praised One is shirk.

Shirk

Shirk consists of associating anyone or anything with the Creator either in His being, or attributes, or in the exclusive rights (such as worship) that He has against His creatures.

Shirk

The associating of partners with God; usually translated as "polytheism" or "idolatry"