could this be an example of dispensationalism:
matthew 25:31-46 teaches salvation by works. as does that one place where they ask Jesus what good thing must i DO and Jesus says keeps commandments because He hasnt died yet.
st.paul teaches salvation by grace through faith eph 2:8-9 2 timothy 1:9.
There is a variety of Dispensationalist view. Opinions vary on how many ages there are. On your issue there is debate on when the so called "church age" begins. My opinion, I would go to Acts 9 as the beginning of "grace age"