[extract from Catechism of the Catholic Church]
1221 But above all, the crossing of the Red Sea, literally the liberation of Israel from the slavery of Egypt, announces the liberation wrought by Baptism:
You freed the children of Abraham from the slavery of Pharaoh,
bringing them dry-shod through the waters of the Red Sea,
to be an image of the people set free in Baptism.
This means that in Baptism, we enter into the water, captive to original sin. But we emerge freed and renewed with grace. In baptism, we are freed to live as sons and daughter of God and to one day enter into the promised land of heaven.