From RAG to Agentic RAG for Faithful Islamic Question Answering. - Gagan Bhatia; Hamdy Mubarak; Mustafa Jarrar; George K. Mikros; Fadi Zaraket; Mahmoud Alhirthani; Mutaz Al-Khatib; Logan Cochrane; Kareem Darwish; Rashid Yahiaoui; Firoj Alam (CoRR, 2026)