Baptism
Martyrdom was identified early in Church history as "baptism by blood", enabling the salvation of martyrs who had not been baptized by water. Later, the Catholic Church identified a baptism of desire, by which those preparing for baptism who die before actually receiving the sacrament are considered saved. Some Christians have regarded baptism as necessary for salvation, though others, such as Huldrych Zwingli (1484–1531), denied its necessity.
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