Childbearing is radically different from the sacrifice system requiring the blood of the innocent in order to prevent ongoing violence between enemies. Instead, childbearing is the is the spilled blood of the willing in order to bring new life.
It is significant that Paul leaves this explicit command out of his instructions to husbands and wives, ESPECIALLY in a patriarchal cultural context in which it would have been expected and appropriate because in a legal sense wives WERE under their husband’s authority. This is actually quite subversive and radical because the expectation would have been a similar treatment, “wives obey your husbands who are in authority over you.” The fact that he didn’t do this is a big red light begging the question “Why?”
Galatians is not about salvation being accessible to everyone. There is never any question in the book whether or not Gentiles can become believers.