Therefore , it is believed that not using wine impedes the transsubstantiation from actually happening .
The Catholic Church does not use grape juice because it believes that bread and wine literally become the body and blood of Jesus Christ , a dogma known as transsubstantiation .
It is believed that not using wine impedes the transsubstantiation from actually happening .
The Catholic Church does not use grape juice because it believes that bread and wine literally become the body and blood of Jesus Christ , a dogma known as transsubstantiation .