There is a little red handle on the gas valve in the oven where the gas line connects. Is that in the up position?
Here is a link to the part that I am talking about. This is the regulator for your oven. See the little red handle. This needs to be open. Sometimes that valve can be broken off.
I won't be able to check until I get home. When open what position should the red handle be? In line with the direction of gas flow?