verily allah forgives not that partners should be set up with him but he forgives except that to whom he wills and whoever sets up partners with allah in worship he has indeed invented a tremendous sin.
إن الله لا يغفر أن يشرك به ويغفر ما دون ذلك لمن يشاء ومن يشرك بالله فقد افترى إثما عظيما