You must advance the gospel to see society reformed. Only born-again people can live born-again lives.
When Christians speak of “preserving a Christian heritage,” that’s the last gasping breath of a dying faith. The Christian influence of that society is about to expire.
You can only talk about "preserving a Christian heritage" when you’re living with the privilege of being the majority in a society. Christians don’t talk about "winning the culture" or "preserving a Christian heritage" in places like Saudi Arabia or Pakistan or Egypt. They pray and strategize and talk about advancing the good news of Jesus Christ.
You cannot preserve a Christian heritage. It's not like jelly that's jarred. You can only live it and advance it through the gospel. It's more like butter that's spread.