Searcher, thanks for that. Can you cite your source?
Even so, JWs don't even baptize in Christ's name. They baptize "on the basis of the sacrifice of Jesus Christ." (w10 1/15 p. 3 par. 1)
There is no passage that even alludes to baptism being linked to Christ's sacrifice. People were baptized by John for repentence of their sins. That is the JW baptism. With Christ, however, people were baptized by holy spirit and into Christ. JWs say this is only reserved for the anointed.
"Therefore, those who become joint heirs with him, with heavenly hopes, have to be “baptized into Christ Jesus,” that is, into the Anointed Jesus who, at the time of his anointing, was also begotten to be a spiritual son of God. They thereby become united to him, their Head, and they become members of the congregation that is the body of Christ." - it-1 p. 252
Most JWs do not realize the difference between the way they are baptized now and being baptized into Christ. I certainly did not until I looked at all the verses that talked about baptism, then read various WT articles on the subject. Most think that the way they perform baptisms is perfectly legitimate, but have no clue they are being baptized in the baptism of John, and not of Christ. In addition, there is no such thing as a "personal dedication to Jehovah" in the scriptures followed by baptism. If you look up Dedication in the Insight book, you will not find a discussion of a personal dedication to God. I haven't done a lot of research on this subject, but from what I have done, many scriptures are used, but not a single one of them says "dedication" in the NWT.
Here's the rub: if one does indeed dedicate themselves to God, it will forever be used as something against that one by man. I've heard many times, 'even disfellowshipped ones are under obligation since being disfellowshipped does not invalidate their personal dedication to God.'
Depending on how that dedication is made, it could be going against what Christ said:
“Again you heard that it was said to those of ancient times: ‘You must not swear without performing, but you must pay your vows to Jehovah.’ However, I say to you: Do not swear at all, neither by heaven, for it is God’s throne; nor by earth, for it is the footstool of his feet; nor by Jerusalem, for it is the city of the great King. Do not swear by your head, since you cannot turn one hair white or black. Just let your word ‘Yes’ mean yes, your ‘No,’ no, for what goes beyond these is from the wicked one." - Matt 5:33-37
I am not saying that one should not promise their life to God if they truly desire to do so. But, the idea of dedication, and that being symbolized by water baptism is not found in the scriptures. I have to do more research on this to see where this idea came from.