Baptism is necessary and the importance of baptism is shown Jesus christ through accepting baptism from John the Baptist. Jesus need not have a baptism form an earthly person but Jeus taught us to fulfil all the rights.
For the perfection of mankind and to establish the relationship with God it is necessary to have baptism. A person is re-birthing through baptism and it saves him from the sin of birth. The person is becoming the heriditory rightual of the child of God throgh the baptism.