For to understand who Son is we have to recognize why he became flesh. In failing to realize the purpose of Christ incarnation it fail to appreciate his mighty work. Christ is the firstborn not because he first arose but he rose to immortal life never again to die. Christ is called begotten Son this does not indicate that he is inferior and not equal with the father. Instead he is the unique God's Son, sharing the same divine nature as God. Bearing all these name and titles can never disprove the deity of Christ rather it gives the clear picture of who Christ is thus, this is the very reason him alone can die for the humanity.
Unless we aware of the incarnation theirs tendency to doubt the deity of Christ. For he was thirsty, hunger, passion he experienced all these for he is fully man and fully God. As a man he experienced it and as God he paved the way for our salvation. One must comprehend how to distinguish between the humanity and divinity of Christ. When we carefully viewed the Arian teaching he also felt to differentiate that makes him to consider the Son is not equal to the Father. Indeed Arius tried to maintain the Monotheism but he failed the very purpose of Son