I am a missionary who has been involved in Ivory Coast off and on since 1995 and was there as recently as September.
This situations is not as cut and dried as this makes it out to be, and is not essentially a Muslim vs. Christian thing.
The Human Rights Watch full report (found here: http://www.hrw.org/en/news/2011/04/09/c-te-d-ivoire-ouattara-forces-kill-rape-civilians-during-offensive) also details hundreds of similarly brutal killings of northerners (Muslims) by Pro-Gbagbo ("christian") forces before the other massacres.
This link details mentions 500-1000 killings in Abidjan by the Pro-Gbagbo "christian" soldiers since November. http://www.undispatch.com/a-very-highly-systematized-and-orchestrated-campaign-of-violence-in-ivory-coast The point is, both sides did some pretty horrific things to a lot of innocent people.
May God help the restoration and reconciliation of Ivory Coast.