Circumcision and baptism share similarity as outward covenant signs but this similarity does not license importing infant practice

There are real similarities: both are outward ritual signs of covenant participation. But the similarities do not justify importing the infant application of circumcision into baptism, because doing so requires selectively applying only one feature of the parallel while abandoning others (male-only, compulsion). The circumcision argument starts with lofty theological principles and draws applications that are not clearly derived from those principles.