Baptism Again???
QUESTION?
Should I attend a re-baptism?
Answer!
No, because the Bible says their is only 1 baptism (Ephesias 4:5). To rebaptize yourself is a heresy and a serious sin against God. Here is a longer answer:
VIII. REBAPTISM
To complete the consideration of the validity of baptism conferred by heretics, we must give some account of the celebrated controversy that raged around this point in the ancient Church. In Africa and Asia Minor the custom had been introduced in the early part of the third century of rebaptizing all converts from heresy. As far as can be now ascertained, the practice of rebaptism arose in Africa owing to decrees of a Synod of Carthage held probably between 218 and 222; while in Asia Minor it seems to have had its origin at the Synod of Iconium, celebrated between 230 and 235. The controversy on rebaptism is especially connected with the names of Pope St. Stephen and of St. Cyprian of Carthage. The latter was the main champion of the practice of rebaptizing. The pope, however, absolutely condemned the practice, and commanded that heretics on entering the Church should receive only the imposition of hands in cenitentiam. In this celebrated controversy it is to be noted that Pope Stephen declares that he is upholding the primitive custom when he declares for the validity of baptism conferred by heretics. Cyprian, on the contrary, implicitly admits that antiquity is against his own practice, but stoutly maintains that it is more in accordance with an enlightened study of the subject. The tradition against him he declares to be "a human and unlawful tradition". Neither Cyprian, however, nor his zealous abettor, Firmilian, could show that rebaptism was older than the century in which they were living. The contemporaneous but anonymous author of the book "De Rebaptismate" says that the ordinances of Pope Stephen, forbidding the rebaptism of converts, are in accordance with antiquity and ecclesiastical tradition, and are consecrated as an ancient, memorable, and solemn observance of all the saints and of all the faithful. St. Augustine believes that the custom of not rebaptizing is an Apostolic tradition, and St. Vincent of Lerins declares that the Synod of Carthage introduced rebaptism against the Divine law (canonem), against the rule of the universal Church, and against the customs and institutions of the ancients. By Pope Stephen's decision, he continues, antiquity was retained and novelty was destroyed (retenta est antiquitas, explosa novitas). It is true that the so-called Apostolic Canons (xlv and xlvi) speak of the non-validity of baptism conferred by heretics, but Dellinger says that these canons are comparatively recent, and De Marca points out that St. Cyprian would have appealed to them had they been in existence before the controversy. Pope St. Stephen, therefore, upheld a doctrine already ancient in the third century when he declared against the rebaptism of heretics, and decided that the sacrament was not to be repeated because its first administration had been valid. This has been the law of the Church ever since. The whole controversy on rebaptism is exhaustively treated by Hefele in the first volume of his history of church councils. https://www.catholic.com/encyclopedia/baptism