Faustus repels the charge of sun-worship, and maintains that while the Manichæans believe that God's power dwells in the sun and his wisdom in the moon, they yet worship one deity, Father, Son, and Holy Spirit. They are not a schism of the Gentiles, nor a sect. Augustine emphasizes the charge of polytheism, and goes into an elaborate comparison of Manichæan and pagan mythology.
Source: Reply to Faustus the Manichaean (New Advent)