Your project doesn't seem to be configured properly. Maybe JSF libs are missing... Maybe faces-config is not in WEB-INF/...
I recomend you to create a JSF project via File->New->Project->JBoss Tools Web->JSF->JSF Project wizard.
And use JBoss Tools server adapter (Target runtime->JBoss Community->JBoss 5.0) instead of Eclipse server adapter (Target runtime->JBoss->JBoss v5.0) it uses incremental depliment instead of building the full war file every time you change something in your project.