First of all, we’d like to state that Ahmadiyyah (also known as Qadyaniyyah) is a deviant group that has nothing to do with Islam. Muslims are to be aware of them, especially after they have been branded as kafirs by all scholars.
Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states: “By converting to Ahmadiyyah you have renounced Islam. Therefore, if you wish to return to Islam, you must do so by saying the Shahadah (testimony of faith) anew.
The Shahadah involves testifying the Oneness of Allah as well as testifying to the fact that Prophet Muhammad (peace and blessings be upon him) is the servant and final Messenger of Allah, after whom there is no other prophet. This involves rejecting the false claim of Mirza Ghulam to prophethood. While rejecting his false claim, you must also affirm your faith in all of the fundamental tenets and principles of Islam as contained in the authentic sources of Islam, namely the Qur’an and the Sunnah, as understood and practiced by the early generations of Islam.
If, for example, as an Ahmadi you had considered Salah (ritual Prayer) to be fard (obligatory) only three times a day, you must recant this belief and reaffirm your faith and practice in five daily Prayers as prescribed by Allah and His Messenger (except, of course, in exceptional situations where it is allowed to combine certain Prayers).”