Shirk (polytheism) is a grievous sin
    
    
        
     
    
        
            
 6) Narrated Abu Huraira 
: Allah`s Messenger 
 said: Among all partners, I am the most dispensable with association. So anyone who performs a deed in which he ascribes to Me others; I will abandon him and his act of polytheism.
(This Hadith is sound and reported by Muslim).
 
 Shirk (polytheism) is a sin that if its doer dies without repentance, he will never be forgiven. Verily, whoever sets up partners in worship with Allah, Allah has forbidden Paradise for him; and the Fire will be his abode.
        
     
    Source/By : Ibn Hameed                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
 From Authentic sources