The rite of initiation by which believers submit themselves to be immersed—either physically or symbolically—in water, confess their faith in Christ, and are admitted into membership in the Christian Church.
An article survey the various modes and interpretations of baptism is being prepared.
Further Reading & Resources:
☰ William B. Badke, "Baptised into Moses—Baptised into Christ: A Study in Doctrinal Development," The Evangelical Quarterly 88.1 (1988): 23-29. pdf 
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