Ibn Hazm's "Fisal" has six parts: 1. non-Muslim religions (in Asín's volumes II-III), 2. Muslim sects (Asín's III-IV), 3. Muslim faith and theology (IV), 4. several constitutional questions regarding Islamic government (V), 5. Muslim heresies (V), 6. theology in 29 questions (V). In part 1 of the "Fisal", Ibn Hazm gives a polemical description of Christian scriptures and trinitarian doctrine, its putative errors and contradictions, showing familiarity with the texts. He also comments on Judaism, Zarathustra, Brahmans, sophists, atheists, and polytheists. According to Asín, many subsequent anti-Christian polemics by Muslims more or less followed part I of Ibn Hazm's "Fisal". Asín, in his "Disertación preliminar" to the "Fisal", compares the late emergence of comparative religious history in Christian Europe with its relative early start in Islam, noting the geographical proximity of Islam to a variety of differing religions. For example, an early Islamic work that discusses Buddhism appeared in the 9th century. Yet Asín more than once refers to Ibn Hazm as the first historian of religions.