Why is Jesus seen as a messenger rather than being considered the only begotten Son of God?

The author calls for knowing the truth and following it to be freed from sins, citing a verse from the Gospel: "And you will know the truth, and the truth will set you free." He affirms that the call of Christ, peace be upon him, is to worship the One God, supporting this with verses from the Gospel that affirm God's oneness, such as: "This is eternal life; that they may know you, the only true God, and Jesus Christ whom you have sent," and "You shall worship the Lord your God, and Him only you shall serve."

The author indicates that the oneness of God is the greatest commandment of all prophets, citing what is stated in the Gospel of Mark: "Hear, O Israel: The Lord our God, the Lord is one; and you shall love the Lord your God with all your heart, with all your soul, with all your mind, and with all your strength." He then mentions that this commandment is the essence of the law and the teachings of the prophets, citing the words of Almighty God: "And We did not send before you any messenger except that We revealed to him that there is no god but Me, so worship Me."

The author explains that the Trinity contradicts the monotheism brought by the prophets, citing what is stated in the American Encyclopedia that "the doctrine of the Trinity, which was adopted in the fourth century AD, did not accurately reflect early Christian teaching regarding the nature of God; on the contrary, it was a deviation from this teaching, and therefore it developed against pure monotheism." He concludes by referring to the Day of Judgment, where the truth will become manifest, citing verses from Surat Al-Ma'idah (116-120) which show a dialogue between God and Jesus, peace be upon him, and Jesus's disavowal of the claim of his deification and his affirmation of his call to worship God alone.