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... Answer updated 7 months ago

Allah, The Glorious says in Quran (9:28) : إنّما المشركون نَجَس INNAMA ALMUSHRIKOON NAJAS. Verily the polytheists are impure. This a Quranic fact which all Muslims should follow.

Those who participate in Muharram believe and love Imam Husain (AS) being a divine leader of Truth, which means that they are not really polytheists even if their families are been classified as non Muslims. Their noble act in commemorating Imam Husain (AS)'s martyrdom reflects their undeclared faith in his values.

Allah Knows what is in the hearts and the acts usually reflect what is in the heart. That is why we take the acts who love Imam Hussain (AS) as an indication of their faith in him and his faith which is Tawheed.