Perhaps, all things considered it was the most merciful thing for the child. God would be the one to know that, not you or I.
Romans 9:20
Nay but, O man, who art thou that repliest against God?
Shall the thing formed say to him that formed it,
Why hast thou made me thus?
I am sure that the slaughter of Egyptian children was perhaps the most merciful thing for them too. Somehow, Chirst is not in that picture!
To answer that I say emphatically YES! God made us rational beings capable virtue. Yes, we are perfectly capable, by God's grace, to ask Him why has He made us thus!
And, please don't quote Paul to me! He was useful for the success of the Church which otherwise would have died out, by brining the redacted Judaism to the Gentiles and creating a religion that would be unrecognizable to Moses.
In that sense, he did God's work, but let's put it in proper perspective. He changed dietary laws, circumcision, and just about everything that made Judaism Judaism externally, symbolically and historically. He is even suspected of being a Gnostic by some. What he did was good for Christianity, there is no doubt about that. Let's leave it at that.