‘Sprinkling’…’Full Immersion’…does it matter to God?

I was (am)  involved in a discussion over at ‘The Prodigal’s Knot…Untied’  http://prodigalsknots.wordpress.com/   on wether baptism has to be full immersion in water, or if sprinlkling or pouring of water is also effective, and constitutes a proper baptism.twins baptism by BEY CHUAComing Clean In Dirty Water by wvgasguy







The discussion at one point turned to inmates in prison, who coud not be baptised because there was “no water available”.

I said, “use some saliva if necessary”,… and then we went on from there.

Is full immersion the only biblical definition of baptism and is that the only way a baptism can be a real baptism?