Will not run after replacing water pump and thermostat

Disconnecting the battery is what causes this. It's due to the idle speed being too low after the Engine Computer lost its memory. Sensor personalities and fuel trim data will be relearned as you drive, without you even noticing, but a very specific set of conditions must be met for the computer to relearn "minimum throttle". Until that is done, the engine may not start unless you hold the accelerator pedal down 1/4", you won't get the nice "idle flare-up" to 1500 rpm at startup, and it may tend to stall at stop signs.

To meet the conditions for minimum throttle to be relearned, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.

It's more likely something is unplugged. The first thing to do is to read and record the diagnostic fault codes. On older Chrysler products that was real easy to do by cycling the ignition switch from "off" to "run" three times within five seconds without cranking the engine, leave it in "run", then watch the code numbers appear in the odometer display.

That feature went away on newer models. If it doesn't work, you'll need a scanner or code reader to read the fault codes.

I'll be waiting to hear back on what you found.