We acknowledge one baptism for the forgiveness of sins.
When I ask my credo-baptist friends if they affirm the Nicene Creed they normally say "yes". I guess most of them now a days do not recite the Apostle's Creed and so they think that the Nicene Creed is the same but just an elaboration of it... until I point out that one line.
The truth is that if you are a re-baptizer, you can not and should not affirm the Nicene Creed because that one line there is not something a re-baptizer believes, why? Because a re-baptizer does rebaptize persons who have received Christian baptism when they were a infants. Because for them the ability to profess faith is a pre-requisite for baptism. I think this misunderstands Sola Gratia.
The fact is that since a re-baptizer can not affirm the Nicene Creed, the re-baptizing Christian is not catholic. Understandably she not Catholic (big C), but she is not even catholic (small c) either.