The peace offering teaches many things, but one of its main symbols is fellowship. Our communion with the Father and the Son obligates us to pursue peace.
The peace (or thank) offering was the most commonly given in ancient Israel. It pictures God, the priest, and the offerer in satisfying fellowship.
[Editors Note: Audio quality improves at the 4 minute mark.]
Why do so many nominal Christians reject works and obedience to God's law? Largely because they fail to gather God's whole counsel on this subject.
Ancient Israel had at the core of its religion an obsession to please the self at the expense of justice and the best interests of the disadvantaged.
When we sin, we have an advocate with Jesus Christ, who has been commissioned to forgive our sins upon repentance. There is no forgiveness apart from Christ.
Israel had every opportunity that the Gentiles did not have. God gave the Israelites gifts to live a better way, but they completely failed to reflect Him.