ALL the reformation churches came from the RC background. All of them fly the supposed Christian Flag flown in some Baptist churches. But that flag was the reformation banner not a baptist banner. Baptist did not come from the reformation they came from around it. And If I am not mistaken Baptist are not from the direct line of Anabaptist, many associate it because of the word baptist in the name. American Baptist are a unique fellowship of believers. See Elmer Towns "Theology Today" he gives a little insight on it.
John Calvin didn't just persecute the Anabaptist he persecuted Wesleyans, the Lutherans, the Presbytery church, the Episcopals, RC and any groups that he could not influence toward his ideas for the church. Later some of these groups created opposition to him while others conformed to him but not to the Bible.