Daf Yomi - Taanis 27 - Reciting the Korbanos

The Gemora states that Hashem told Avraham Avinu that whenever Klal Yisroel will read the Torah portions pertaining to the korbanos, it will be regarded as if they brought korbanos and their sins will be forgiven.

It can inferred from this Gemora that one can merely say over the verses of the korbanos even if he doesn't understand them or delve into the deeper meanings of the korbanos.

Rabbeinu Bachye cites the Gemora in Menochos (110a) that one must understand and learn the halachos of each korban in order for it to be considered as if he actually offered a korban. The Mishna Berura rules like this as well.

The Meiri states that it is the remembering of the korbanos which is instead of the offering of the korbanos. He explains that even when the korbanos were brought, the korban did not bring about the atonement; rather the forgiveness came because of the repenting that one did while he offered the korban. This explains why now, when the Beis Hamikdosh is not in existence, the mere remembrance of the korbanos can provide atonement since when a person remembers the korbanos, it propels him to do a proper repentance.