The same way one eats the body and blood of the Lord.
Every Biblical ritual, from the original Passover to the shortened version called the Lord's Supper to Immsersion (Baptism) is created so that we can physically act out a spiritual reality. For example, Paul explains Immersion thusly:
Buried with Him in baptism, wherein also ye are risen with Him through the faith of the operation of God, who hath raised Him from the dead. (Col. 2:12)That is, when baptized, we symbolically "die" to our old lives, are buried with the Messiah, and are raised together with Him into a whole new life to be lived in His Spirit. So far, so good, right?
Now, knowing the symbolic meaning of baptism, do we then read that back into every reference to baptism made by the Apostles in such a way as to preclude the physical enactment of the ritual? Of course not. Why then should we suppose Paul to be speaking of keeping the Passover only spiritually, not also physically, in 1 Co. 5?
pascha has been a Christian holiday since the start. it waslutheran protestants who invented the easter bunny as a means of hiding fasting and the traditions of the church from their children by RECITING PAGAN STORIES ABOUT A GODDESS TURNING A BIRD INTO A RABBIT THAT LAID EGGS.