bod, such as it is, does not replace Baptism; it is only a baptism, analogically speaking, as per even the Catholic Encyclopedia. That's because it only supplies the ONE effect of Baptism, namely, the remission of sins. As such, while bod may suffice for justification (remission of sin), it does not suffice for salvation ... as per the Church Fathers, even St. Ambrose, who is cited as one of the two authorities behind the concept. And it's rejected out of hand by several Church Fathers (5 or, arguably, 6).