Covenant Count
The question... is whether we may speak of the Abrahamic covenant (singular, so the Reformed) or Abrahamic covenants (plural, so the Baptists). The antipaedobaptists had to speak of two covenants made with Abraham: works and grace. By doing so, they were able to argue that circumcision belonged to the Abrahamic covenant of works and not to the Abrahamic covenant of grace.
Joel R. Beeke and Mark Jones, A Puritan Theology: Doctrine for Life (Grand Rapids, MI: Reformation Heritage Books, 2012), 740.