Did the religion of Islam completely eradicate Arab paganism?
Sam Shamoun

Muslims claim that they are expressly forbidden from joining partners with
Allah:

Lo! Allah forgiveth not that a partner should be ascribed unto Him. He
forgiveth (all) save that to whom He will. Whoso ascribeth partners to
Allah, he hath indeed invented a tremendous sin. S. 4:48 Pickthall

Narrated Anas bin Malik:
The Prophet said, "The biggest of Al-Kaba'ir (the great sins) are (1) to
join others as partners in worship with Allah, (2) to murder a human being,
(3) to be undutiful to one's parents (4) and to make a false statement," or
said, "to give a false witness." (Sahih al-Bukhari, Volume 9, Book 83,
Number 10)