Car will crank but not start

Can you hear the fuel pump run for about two seconds once you first turn the key to run, before you turn the key to start?
If not is there any security or theft light remaining on past bulb check, about fifteen seconds or so or is the security light flashing?

Does the security light go out with the key in the ignition after fofteen seconds or so?
Can you hear the fuel pump run for about two seconds once you first turn the key to run, before you turn the key to start?

Does the security light ever go out with the key on the run position?
Is there any check engine light remaining on also?

Okay, you have a few choices, if you have a scan tool or code reader see if you have any codes stored, especially any referring to the crankshaft position sensor cause it could prevent it from starting if it was bad.
Or you could see if the engine will start and run for a few seconds after spraying a few small shots of starting fluid into the throttle body to rule out any fuel system problem. So if it does start and run for a few seconds, then you know it has spark. Which brings me to the last, checking for a spark on at least one cylinder while cranking over the engine, plus if you have a tachometer on the instrument cluster if it does not even show a cranking rpm of around 100 rpm. Then you can almost bet you have a faulty crankshaft position sensor and/or wiring to/from it.

You may want to start to suspect a faulty crankshaft position sensor, but you should still try to retrieve any codes. Do you have or can you borrow a scan tool or code reader?
If you want to just try replacing the crankshaft position sensor, I could get you some instructions but I only see either a 3.5 or 3.8 engine, not a 2.1. If the eighth digit of the VIN number is an H, it is the 3.5 and if it is a K, it is the 3.8.

Okay, and post back the eighth digit of the VIN number.