Why is water significant in the baptismal ceremony today?

Answer 1

To baptize means to “immerse” in water. The one who is baptized is immersed into the death of Christ and rises with him as a “new creature” (2 Corinthians 5:17). This sacrament is also called the “bath of regeneration and renewal in the Holy Spirit” (Titus 3:5); and it is called “enlightenment” because the baptized becomes “a son of light” (Ephesians 5:8). The symbolism of water signifies the Holy Spirit's action in Baptism, since after the invocation of the Holy Spirit it becomes the efficacious sacramental sign of new birth: just as the gestation of our first birth took place in water, so the water of Baptism truly signifies that our birth into the divine life is given to us in the Holy Spirit. As "by one Spirit we were all baptized," so we are also "made to drink of one Spirit." Thus the Spirit is also personally the living water welling up from Christ crucified as its source and welling up in us to eternal life.

Answer 2

Water is important because it purifies. So, when you are baptised in the catholic church, your sins will be purified.
note:read Catechism of the Catholic Church for more information.

Answer 3

Water was the original method of baptism used by St. John the Baptist. Emerging from the waters of baptism symbolizes rebirth.