These missionaries who try to "prove" that Jesus is somehow kosher misuse Jewish sources including Rashi. Because the missionaries misquote, take out of context or just totally lie about what Jewish sources have to say it is necessary to explain what he really wrote and explain it. I would imagine that any Christian who bothers to read trief like Shapira have some interest or they wouldn't have bothered to read his books in the first place.

סופי

And everything that Sarah tells you, listen to her voice. Bereshit (Genesis) 21:12