Final answer:
The Sacrament of Baptism is necessary for salvation as it purges original sin and connects individuals to God. It is a crucial rite in Christianity, especially for newborns, as it ensures entrance to heaven. Baptism is also one of the sacraments conducted by ordained priests.
Step-by-step explanation:
The Sacrament of Baptism is considered necessary for salvation due to its role in purging original sin and connecting individuals to God. In medieval Christianity, baptism was seen as crucial for newborns, as without it, they would be denied entrance to heaven. Baptism is also one of the sacraments conducted by ordained priests, and it signifies the initiation into the Christian community.