Rebuilding amidst the rubble

On a mailing list I'm on, some folk were saying that since the West is doomed, we should retreat from society and just try to teach individuals about salvation. To which I replied:

Let me say this: If you think a post-Christian society looks bad, you should see a pre-Christian one. The difference that Christianity still makes on British society today is colossal. If you don't       believe me, move to East Africa. We should certainly not give up on teaching Christians about what a Christian society would look like, and arguing in the public square for one, because Jesus still has all authority in heaven and on earth, and once the present form of Western civilisation collapses we will want our descendants to know what they are trying to rebuild amidst the rubble, rather than having them clueless because we only taught them about individual salvation.