First off, the anti theft system (if we are talking about the PATS Passive AntiTheft System) in that vehicle cannot be bypassed. It is part of the PowerTrain Control Module and PATS module and cannot be unprogrammed or removed without making the vehicle inoperable.
But with your concern, lets take a look at a couple of things.
One, the PATS disables the ignition circuit, therefore, if the PATS was a problem, it would not run on starting fluid.
The inertia switch is on the power side of the circuit, however it will only have power for a few seconds (about 5) when the key is cycled on. This is normally a 2 person test, one to check for power to and through the inertia switch and one to handle the ignition switch.
If you do not have power to the inertia switch, then you probably have a bad relay. However, it will not stop there. The main reason that the relay fails is due to excessive current flow and arcing of the relay contacts. This is normally caused by a failing Fuel Pump.
But, having said all that, chances are you will find that you are getting power to the inertia switch and the fuel pump is just plain not working. This is pretty common on vehicles that are over 8 years of age.