The teaching authority of the
Church, the Magisterium, has
clearly stated the role of baptism in the
life of the Christian.
Lateran Council
IV, 1215
Infallibly defined
that baptism was a sacrament of the Church.
Council of Lyons
II, 1274
Infallibly redefined
that baptism was one of the seven
sacraments.
Council of Trent,
1545 - 1563
Again infallibly
defined the seven sacraments listing baptism
as the opening gateway and
foundation of the sacraments.