I've always been hopeless at interpreting this output, but it doesn't look too open with that REJECT all at the end of RH-Firewall-1-INPUT
If you are able to safely disable your firewall, flush the rules out (you can use the following script if you want)
http://iptables-tutorial.frozentux.n...SH-IPTABLESTXT
Otherwise, insert a rule into RH-Firewall-1-INPUT to permit port 53.
See how that goes.