Abrahamic religions teachings of Quran are presented as the direct revelation and words of Allah. Islam (meaning "submission", in the sense of submission to God) is universal (membership is open to anyone); like Judaism, it has a strictly unitary conception of God, called "tawhid", or "strict" or "simple" monotheism. Historically, the Abrahamic religions have been considered to be Judaism, Christianity and Islam. Some of this is due to the age and larger size of these three. The other, similar religions were seen as either too new to judge as being truly in the same class, or too small to be of significance
Islam and other religions Arab conquest of the Buddhist center of Balkh, a Quranic commentator was denounced for anthropomorphism, a standard attack on those sympathetic to Buddhism. Hiwi al-Balkhi had attacked the authority of Quran ad revealed religions, reciting the claims of Zoroastrianism, Christianity and Judaism. In the early 11th century, the Islamic scholar Abū Rayhān Bīrūnī wrote detailed comparative studies on the anthropology of religions across the Middle East, Mediterranean and especially the Indian subcontinent. Biruni's anthropology of religion was only possible for a scholar deeply immersed in the lore of other nations. He carried out extensive, personal investigations of the peoples, customs,