The Catechism states this:
“460 The Word became flesh to make us “partakers of the divine nature”:“For this is why the Word became man, and the Son of God became the Son of man: so that man, by entering into communion with the Word and thus receiving divine sonship, might become a son of God.” “For the Son of God became man so that we might become God.” “The only-begotten Son of God, wanting to make us sharers in his divinity, assumed our nature, so that he, made man, might make men gods.””
Using Atticus Finch’s logic applied to the above, this mean that Jesus became a sinful man, because “our nature” includes original sin, and “man” [we] are sinful. However obviously that is not the case. Similarly, I am confused as to why he is trying to force this interpretation of the “as man is…” couplet, when the LDS are telling us that they don’t believe that the Father was a sinful man. If the couplet is implying that the Father was a sinful man because of “as man
“is””, then the Catechism is also implying that the Son became a sinful man, since He “assumed our nature”, which includes original sin.