Purim is a day of ecstatic rejoicing, which the Jews celebrate as both a sign of G-d’s enduring love and a promise of their final salvation. There’s nothing in the holiday that contradicts Christian faith, except for one thing: it usually falls out smack in the middle of Lent.
The four holidays of this coming holiday season correspond to the events of Holy Week and the Ascension. They are a figure of the great salvific events which mark the last days of Jesus’ human presence in this world. The Christian Jew participates in those saving events, and immerses himself in the Christian mysteries of salvation as he celebrates the Jewish holidays.