The relationship between circumcision and baptism is usually treated as a subdivision of the question of infant baptism. It ought to be the other way around.
Baptism is a covenantal ceremony.
We must first discover the meaning of a covenantal ceremony in general, then seek to understand the meaning of that particular ceremony in the old covenant which finds its fulfillment in the new. In our last chapter we looked in the meaning of covenantal ceremonies by considering Adam and Eve in the Garden. Now we are prepared to discus the far more controversial and theologically significant question of circumcision. And he that is eight days old shall be circumcised among you, every man child in your generations, he that is born in the house, or bought with money of any stranger, which is not of thy seed. There are at least four important points to be noted.