Re-baptism of a believer is unscriptural and has no place in the life of a church.
That depends on what they claim is baptism! A believer may be sprinkled but that is not baptism. A believer may have been poured upon but that is not baptism. A believer may have been immersed by a Catholic priest but that is not baptism as authority to administer baptism is given to "discples" of Christ who are like faith and order with Christ in the same gospel, same baptism and same basic faith and order (Mt. 28:19-20).
Another thing, the phrase "in Christ" has several different applications in scripture. The most obvious one is our spiritual union with Christ by regeneration (Eph. 2:10a). However, it is also used to describe the metaphorical body of Christ the local congregation made up of PHYSICAL bodies of the believers (1 Cor. 6:17-19; 12:27). So baptized "in" or "into" Christ with regard to water baptism does not bring us into spiritual union with Christ (baptismal regeneration) but into the congregational "body of Christ".
Another thing, every example in the book of Acts where baptism in water is found is administered by a disciple that is not merely like faith and order with Christ in the Great Commission essentials (Mt. 28:19-20 with Acts 2:40-41) but were administrators within a New Testament Congregation. Philip baptized the Samaritans and the congregation at Jerusalem followed up (acts 8:14) and the results were congregations in Samaria (Act 9:31 interpreted in connection with Gal. 1:22 "churches"). The congregation followed up on the baptism by its members in Antioch and consequence was a New Testament congregation (Acts 11:19-27). Why would the Eunuch be any different? When you have clear precepts (Mt. 28:19-20) followed by clear example (Acts 2:40-41) why would you choose to interpret the Eunuch based upon SILENCE any differently? Can you find anywhere in the conversation between Philip and the Enuch where Philip had mentioned baptism?? No! So the argument based on silence is wrought with difficulty even with baptism.
I agree with our poster that baptism is a congregational ordinance, but not just any congregation, but the congregation that is like faith and order WIITH CHRIST in the gospel, in baptism, and in essential doctrine and practice. The only place where authority to baptize is addressed in Scripture is Matthew 28:18-20 and in that text there are three groups of people identified:
1. "ye"
2."all nations"
3. "them"
Who did Jesus give authority to administer water baptism unto? Not the lost "all nations." Not unbaptized untaught believers ("them") but only to "ye" who are "disciples" which have been discipled or followers of Christ in the same "gospel" same "baptism" and same faith and order, as the contextual "ye" had already been through the threefold process listed in Matthew 28:19-20. They had been gone to with the gospel by John the Baptist (Acts 1:21-22), they had been baptized by John the Baptist (Acts 1:21-22; Lk. 7:29-30). They had been taught how to observe all things commanded by Christ for the past three and half years (Acts 1:21-22) in a congregational body of baptized believers.
The difference between just getting wet and being baptized is that baptism is administered "in the name of Christ." That does not refer to mere verbalization as in "I baptize you in the name of......" followed by immersion. That means the baptism is administered in keeping with the commands of Christ or how Christ authorized it to be performed and he never authorized unbelievers ("all nations") or unbaptized believers ("them") or believers who do not identify with a teaching observing assembly that is like faith and order with Christ ("them"). The authorized administrator is one that goes with the same gospel Christ preached, administers the same baptism that Christ administered and teaches the same faith and practice Christ commanded to be observed - or congregations of like faith and order AS SEEN IN THE NEW TESTAMENT.
Notice it is the same kind of "ye" that goes with the gospel that is authorized to administer baptism.
Notice it is the same kind of "ye" that teaches them how to observe all things whatsoever Christ commanded that is authorized to administer baptism. Christ does not want believers in him to publicly identify with any other kind as all other kinds are APOSTATES from the faith (Acts 20:29-30; 1 Tim. 4:1; 2 Thes. 3:6; Rom. 16:17).
If you claimed to be saved and then invited us to the Roman Catholic Church in order to be sprinkled, poured or immersed what does that public identification with that administrator loudly proclaim? It proclaims you are a Roman Catholic in doctrine and practice or why else choose to publically identify with that particular denominational administrator??? If you chose a Methodist or a Prebyterian, etc., Christ does not want any of his people to publicaly identify with any public institution but his kind, which are identified by the same gospel, same baptism and same faith and order he commanded and which are illustrated throughout the new Testament.
To be baptized in the name of Christ is to be baptized so that person identifies with Christ in the gospel, Christ in baptism and Christ in congregational observance of all things commanded.
Beleif in the gospel gets one into heaven, whereas water baptism is the prerequisite that gets one into the church. The former has to do with salvation while the latter has to do with service.
The plural "ye" authorized are identified in acts 1:21-22 as the congregational body of Christ wherein each member has already been through the same threefold process outlined in the Great Commission with regard to the SAME gospel, SAME baptism and SAME faith and order. That threefold process is how one is MADE A DISCIPLE of Christ and that is ONLY KIND of disciple that are authorized by Christ to be produced by his congregations.