In this sermon Aba Al-Sadiq (pbuh) clarifies that there is no excuse to disbelieve in the Vicegerent of God using examples from the stories of the Prophets and Messengers.
We are the Ahmadi Religion of Peace and Light. Our call is a universal call, calling all the people of the world from all walks of life, all nationalities, and all backgrounds to acknowledge the Supremacy of the absolute one true God.