What is Baptism? For individualized/private/personal faith, baptism is diminished to a confusing and unintelligible non-tangible reality, i.e. "an outward sign of an inward reality." As such, it's easily set aside as an add-on.
For communal, messianic, kingdom faith, baptism is an initiation into a new/alternative social reality where Jesus is Lord and King of all. In this case, a person dies to "self-governing" freedom and self-centered love as she submits to the Lordship of Jesus and others-centered love. Rather than being an add-on display of inward realities, it is the true birth of a new life into an eternal Kingdom.
(Photo credit: http://commons.wikimedia.org/wiki/File:Baptism-of-Christ.jpg)