So why are you an Ahmadi Muslim? The first thing that is very important to understand is that we are Ahmadi Muslims, and as such, we believe in and practice all the fundamentals of Islam. Hadhrat Mirza Ghulam Ahmad, may peace be upon him, the founder of the Ahmadiyya Movement in Islam declared his beliefs:
“We do believe that there is none worthy of worship except God Almighty and Sayyedna (our chief) Hadhrat Muhammad, the Chosen One, peace and blessings of Allah be upon him, is His Messenger and the Khatamul-Anbiya. We believe that angels are a reality, that Resurrection is a reality, and that the Day of Judgement is a reality; that Heaven is a reality and so is Hell.
We do believe that whatever the Glorious and Majestic God has stated in the Holy Qur’an and what ever our Prophet, peace and blessings of Allah be upon him, has stated, is all according to the aforementioned statement, the truth. We do believe that the person who subtracts an iota from the Islamic law or adds to it as much, or lays the foundation in any manner for the rejection of Islamic injunction or attempts to declare unlawful what has been lawful in Islam, is an infidel and a renegade to Islam. We admonish our Jama’at that they must adhere tenaciously to the fundamental article of faith that ‘La illaha illallaho Mohammadur Rasoolullah’ ‘There is no God but Allah, Muhammad is His Messenger’. As long as they live and they should die holding fast to the same belief.
Also, they must have firm faith in all the Messengers of Allah and Revealed Books which have been authenticated by the Holy Qur’an. They should abide strictly by the Holy Qur’anic injunctions. They should strictly observe Prayers and Fast, pay Zaka’at, and perform the Hajj. They should observe Islam by fully complying with all the injunctions, obligations and prohibitions pronounced by God and His Messenger….We call to witness the heaven and the earth that this exactly is our faith.”
Hadhrat Mirza Ghulam Ahmad - Ayyamus-Sulh p323
As Muslims we believe in all of the pillars in Islam and there is no fundamental difference in what we believe to any other Muslim. If that is the case, then why do we call ourselves Ahmadi Muslims, why not just call ourselves Muslims or Sunni Muslims? For this we need to look at the claim of Hadhrat Mirza Ghulam Ahmad, may peace be upon him, the founder of Ahmadiyyat, to understand the difference between Ahmadi Muslims and so called non-Ahmadi Muslims.