Go here to read.
I am copying it here as well:
How many adoptable orphans are there in the world?
How many Christians are there?
What is percentage of Christians would it take to adopt all the orphans?
My best guess (looking at the data available, see my Orphan Statistics post) is that 40-50 million orphans worldwide are adoptable or would be best cared for through adoption. Ideally that means adoption locally/indigenously first and then adoption internationally.
As for Christians, according to Mission Frontiers, globally there are:
Christian Believers — 800 million who have been born again into a personal relationship with Jesus Christ.
Other Christians — 1.37 billion who consider themselves Christians because they come from a Christian culture.
Culturally near non-Christians — 1.8 billion are not yet Christians but live in a people where a viable, indigenous church movement has been established.
Therefore, if roughly 6% of the born again Christians in the world adopted we could care for all the adoptable orphans in the world (I have heard 7% used and that might be true as well).Either way you add it up, there are way too many orphans worldwide and way too many Christians to not believe we can make a difference!