Answer:
The Roman Catholic Church service centers on the priest who performs the Mass, with the celebration of the Eucharist, in which it is believed that the bread and wine become the actual body and blood of Jesus Christ (transubstantiation.) The homily, or sermon, is generally short and not the center of the worship service.
The Baptist Church service, like most other Protestant Church services, focuses on the proclamation of the Word, i.e., the reading and preaching of Scripture, so the sermon tends to be longer and becomes the focus of the service. The Lord's Supper (the Eucharist or Communion) might not be celebrated in every worship service, and the bread and wine are believed to symbolically represent the body and blood of Christ.