Why did the Romans sacrifice animals?

Answer 1

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If we remember that Jews sacrificed animals until the destruction of the Temple in 70 CE, and that even Christians would have done so during the same period, then the behaviour of the Romans will seem quite rational. Just as the Jews and early Christians thought that their God required the constant sacrifice of animals, so also the pagan Romans thought their gods required similar sacrifices if they were to be propitiated. Had the Temple remained in Jerusalem, who knows what sacrificial rituals would be passed down to the churches of today.

Answer 2

One of the topics in the Torah (Leviticus ch.1-8) is that of sacrifices. Since the Holy Temple doesn't exist today, we don't now offer sacrifices. In earlier times, sacrifices were one of the ways of serving God; a type of manifest prayer. They consisted of bullocks, goats, sheep, rams, turtle-doves, or fine flour, accompanied by an offering of oil and of wine (see Numbers ch.15).
Some of the ideas included in the sacrifices are: gratitude (the Shelamim-offering, Leviticus ch.3), dedication to God (the Olah-offering, Leviticus ch.1), celebration (the Hagigah-offering during Festivals), atonement (the sin-offerings, Leviticus ch.4-5), and public worship (the offerings in Numbers ch.28-9).
Our traditions teach that as long as the sacrifices were offered in the Temple, the world was blessed (Talmud, Ketubot 10b) and atoned for (Sukkah 55b).
Some people have a misconception that the Prophets were not in favor of sacrifices. This is a mistake. What the Prophets meant was that repentance and obedience to God are essential; they should accompany the sacrifices and cannot be replaced by the sacrifices (or anything else). Thus the same Prophet Samuel who said that obedience is more important than offerings (1 Samuel ch.15), himself offered up sacrifices to God (1 Samuel ch.13). This ideal of offerings together with repentance is explained in the Talmud as well (Berakhot 23a). The Talmud adds that, similar to the offerings, Torah-study and repentance also must go hand in hand (Berakhot 17a).
Another misconception is that Judaism changed after the Temple's destruction, as it turned from a sacrifice-centered religion to a focus on prayer. It should be pointed out that Jews always worshiped in synagogues, even when the Holy Temple stood. Even within the Temple premises, there were several synagogues. During the Second Temple era, ancient Greek authors attest to the large synagogues that stood in all the countries where Jews lived. The Dioploston in Alexandria, for example, was famous for its size (Talmud, Tosefta Sukkah 4:6). In First Temple times also, synagogues served the same function that they do today (Talmud, Megillah 26b and Berakhot 31a).