Could it be that God is at the center of his life but not hers?
As for the abortion he can’t physically stop her. The law is on her side after all she “has the right to choose” and if he tried legally to stop her, he would be views as “trying to control her body”. (Yes it has happened in past court cases) It may be his baby but it is in her body, so says the courts. The courts have ruled that he does not “own” her as her husband.
So yes all he can do is sit back and what her kill the other two. There is nothing legally he can do as long as Roe vs Wade is on the books.
I personally would like to know why this woman is that selfish. She could not have any before now she would have three? Sounds like a plan to me. However some are just ungrateful.
Legally? Yes. Morally? No. What he did here was just as bad as Adam going along with Eve's sin. Apparently in this marriage, the "father" was the morally aware one, since he knew abortion was wrong. But he stood by and let his children be murdered in front of him.
I thank God that I have a husband who has enough courage to stand up to me when I'm wrong. If I was ever somehow temporarily insane and wanted to kill my child he wouldn't be holding my hand while I did it.