
Originally Posted by
Philipvs Vallindervs Calicvla
God gave an ordinance to Peter to baptise the gentiles in Acts 10. Baptims replaced circumcision as the mark of the covenant. 300 years later the Council of Nicea determined that baptism with water in the name of God the Father, Son and Holy Ghost was necessary in order to enter into full comunion with the Church; they also determined that the act was effective even if the baptising priest was an Arian heretic.
Irrc the Sunday thing came in around 200 AD when Christians began celebrating the Resurrection rather than the Sabbath.
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