I personally believe that when people become lax, lazy, and comfortable, they forget Christ. In the West, we see this clearly.
However, when faced with persecution or suffering, faith in Christ grows exponentially. While the West may be degenerate and sliding into decadence, the Old World will be the hope for Christianity.
> China
The world's most populated country. Here, already 75million Chinese and growing, have accepted Christ. The more the communist government oppresses, the more Christians are found within the people.
> Indonesia
With no connection to Arab nationalism, Indonesians already feel out of place being in a heavily Arabized faith. At the current rate of conversion, 2million per year, Indonesia may become Christian by 2040.
> Iran
This may come as a shock, but the rate of conversion amongst Muslims to Christianity is exponential in Iran. People tire of the Islamic regime's disgusting cruelty, and their massacre of Christian villages even outside of Iran. The current protests could lead to the downfall of Islamic Iran. If this happens, the millions of underground Christians will be publicly safe to practice their faith. Estimates range from 2-3.7million Christians in Iran so far. I have a few Persian friends and they can attest that Christianity is spreading like wildfire there.
Pray for these nations to become with Christ. I know they can do it!