Here are a few denominational descriptions of baptism:
Baptist: It is not entirely necessary for salvation. By immersion only. Baptisms of other churches accepted if done by immersion. Infants are not baptized. Candidates must first believe.
Roman: By pouring, sprinkling or immersion. Baptisms of other churches accepted when performed as Catholic Church prescribes. Necessary for salvation. Infants are baptized.
Eastern: By immersion for the remission of sins and entrance into church. Essential to salvation. Must be performed by one holding proper priesthood authority. Required of all 8 years & older. Infants are not baptized.
Methodist: By sprinkling, pouring, or immersion. Is only an outward sign of one’s entrance into the church. Baptisms of other churches accepted. Not necessary to salvation. Infants are baptized.
A few questions I have:
If baptism is symbolic, what does being baptized with the Holy Spirit and fire by Jesus really accomplish?
If it has to be done by ordained clergy, who was doing it before there were any ordained clergy?
If it really does change something to be baptized as a believer, what does it change?
An extensive study on baptism is on Page 2 of my website: Being Baptized.