When the host is consecrated it becomes the true body and blood of Christ. Does the fact the person does not believe it is make a difference? As an example, if you are given a shot of moraphine, your belief that it is not moraphine does not change the effects on your body. It would seem the same things happens with the host. The body and blood of Christ enters your body and gives you Grace, no matter what you believe. Thanks and God Bless. Bill
Every one of the sacraments is a personal encounter with Jesus. Grace is a share in His life and in His love. He never forces His love on anyone. Certainly the reality of the presence of Jesus in the Eucharist does not depend on the state of soul of the communicant. One can receive the Eucharist as an act of sacrilege. But one cannot receive the grace of the sacrament without a proper attitude or disposition. It’s like going to the well without a bucket. The water is real. But without a bucket, one leaves without any water. Love is two-ways. One cannot enter into a love relationship without being willing to love.
Fr. Vincent Serpa, O.P.