[quote="runningdude, post:1, topic:192961"]
A bit of background on why I'm asking this. A friend of mine was secretly baptized Catholic by her Grandmother, and subsequently raised Baptist by her parents, and eventually chose an adult Baptism by immersion when she was older. I have no doubt that the first Baptism was valid (if not necessarily licit due to lack of parental consent).
Now, she isn't going to convert to Catholicism anytime soon, but my question is about those who receive only the Baptist Baptism. According to my friend, Baptist's don't believe that Baptism has any spiritual effect, but is merely a public profession of one's faith. They believe accept Jesus Christ as their savior is enough. They do believe however that they are Baptizing in the Christ commanded for their understanding of the church. My question is they come home to the Catholic Church, do we recognize this as a valid Baptism?
Does this Baptism confers Christ's saving grace despite their difference in understanding of what happens in Baptism?
While not coming from precisely the same angle as Roman Catholicism, we (Lutherans) are pretty much the same as regards validity. In the case of your friend, her first baptism was valid, but illicit. Therefore, her Baptist immersion was not a baptism because she was already baptized as an infant.
However, someone who was not baptized as an infant but later on in a Baptist church would be receiving a valid baptism. That they don't believe it regenerates has no bearing on its validity because its validity comes from being baptized according to Christ's institution. Incidentally, we do believe it grants the gifts of rebirth and the Holy Spirit, even if they don't.