Paul urges us to present our bodies as “a living sacrifice.” This was written to people who, unlike us, were very familiar with ritual animal sacrifices...

God knows what He is doing.

The problem was that since the Jewish people were part of the original human project it turns out they were in “the ditch” too, hopelessly bound by Sin and Death. The “tow truck” also needed to be rescued. In such a hopeless predicament, how could humanity ever be rescued? 

Over and over in these chapters Paul reminds the Church in Rome that God has not and will not ever reject His promise to the Israelites.