He was among the founder-members of the Jamaat-e-Islami and a close associate of Abul A'la Maududi and Amin Ahsan Islahi.
However, due to irreconcilable differences with its leadership, he quit Jamaat in 1994[1][4] and founded the Islamic religious and political party tehreek e Islami along with his fellows in 1994.
[5] Siddiqui started his literary career by joining biweekly magazine, Kausar, from Karachi under the editorship of Nasrullah Khan Aziz.
He was credited as a poet of a unique style and wrote verses on religious, political and social issues.
[6] Siddiqui is well-known for his biographical work on Islamic prophet Muhammad, Muhsin-e-Insaniyat, or The Benefactor of Humanity.