Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 1 year ago

Polytheism شرك is to worship with Allah some one or something else. Those who did polytheism in the past then left it and became Muslims will be forgiven because they have left polytheism, but those who insisted on polytheism and died  with it, will not be forgiven as you read in (Quran 4:48).