Do They Know It's Christmas Time?

Probably not.  The African countries that have Ebola (for which this re-recording is aiming to raise money for) are Liberia, Sierra Leone, Güinea, Nigeria and Mali.  The total population for these countries is 209.2 million, of which just 43.4% are Christian (54.7% are Muslims with the remaining 1.9% following traditional African religions).  I suppose they might be aware it's Christmas time but most of them won't give a töss.