Mark Rushdoony has an answer for those who look at the state of the world, despair of the gospel, and say “Just look around you.”
https://chalcedon.edu/blog/be-encouraged
All right: look. “Yet what do we see each Christmas? The world must stop and recognize the impact of Jesus Christ on history.”
It’s a short little essay, brief but to the point. For me to say more would spoil it.