[fortheDeclaration]

No, even willful rejection of water baptism would not damn anyone since they are saved before they refused to be baptized!

Mark 16:16 is referring to spiritual baptism, and that is the baptism that places the believer in union with Christ (1Cor.12)

[xzins]

ftD, willful rejection of baptism is probably a sign that the person has not truly become a believer in the Lord.