Muhtaram Rafi Bhai,
Yes, all true religions had their source with Allah. Later, all of them were distorted by men.
Islam is unique in that it is not a religion (Mazhab), it is a DEEN fully preserved in the Qur'an, a System of Life based upon peace and justice.
Mullah's Imamist Islam is, however, a religion like others with weird beliefs, dogmas, rituals and rites which are the hallmark of other religions.