Remarkably, though, this deeply spiritual sign was given to Ishmael as well as Isaac, even though only Isaac was the continuation of the promised line… Circumcision … didn’t automatically mean the recipient of the sign was in possession of the thing signified. Circumcision, like baptism, also pointed to belonging, discipleship, covenant obligations, and allowed for future faith that would take hold of the realities symbolized. Just as there were some in Paul’s day who were circumcised but not really circumcised (Rom. 2:25-29), some children of Abraham who were not truly children of Abraham (Rom. 9:6-8), so in our day there are some who are baptized who are not truly baptized. Children should be marked as belonging to the covenant, but unless they exercise saving faith, they will not grab hold of the covenant blessings.