Hello! I just wanted to briefly point out that the Romans did perform human sacrifices. A notable case occurred in 216 B.C. shortly after the Battle of Cannae when the Romans, having consulted their sacred books, proceeded to bury alive in the Forum Boarium a Gallic man and woman as well as a Greek man and woman (Livy 22.57.6). Similar sacrifices apparently took place in 228 (Plutarch Marcellus 3.3-4) and 114/3 (Plutarch Roman Questions 83), though the Senate finally banned the practice in 97 (Pliny Natural History 30.3). Nevertheless, one could probably lump all the other forms of ritualized killing embraced by Romans under the category of human sacrifice (e.g., burying Vestal Virgins as punishment).

I'd point you towards a book called "The Death and Resurrection of the Beloved Son: The Transformation of Child Sarcifice in Judaism and Christianity" by Jon D. Levenson. I had the chance to read most of it for a college class a few years ago, and it handles the subject very well, viewing how human, and specifically child, sacrifice was treated. You might also want to read through "Fear and Trembling" by Kierkegaard, as it's an interesting mediation on what it is to sacrifice a child for God.

If you want the quick version, though, Levenson essentially sets out to show that in very early Judaism there was human, specifically child, sacrifice. Early biblical writing calls for the first born son to be sacrificed (Exodus 12:2 and 22:30 specifically) and there are instances of it noted in both the Bible and contemporary accounts. However, the practice was not sustained. Like many Judaic/Christian rituals, the ritual of child sacrifice was eventually replaced with others which would "redeem" the son. This was mainly done through paying tribute, increased animal/harvest sacrifice, and circumcision. That last one is going to be contentious, so to explain, it comes down to when God tried to kill Moses, but Moses was redeemed by the blood of the circumcision of his son (Exodus 4:24-26).

Honestly, I could parrot the book some more, but I'd say track down a copy and give it a read. It really is great; it goes over isolated Judaic cities where prevalences of child and human sacrifice were very high, compared to places where it was rarely (if ever) used. It talks a lot about the repercussions of Abraham's actions (as Kierkegaard does), and follows the evolution of the blanket commands from Yahweh (Judaic, Old Testament God) for the sacrifice of children to him, and draws together a lot of instances of human sacrifice in Judaic/Christian writings and compares them. I'd pick it up!