2005 Kia Sedona cranking but not firing

Have you checked for spark yet? Also did you check actual fuel pressure or that fuel was just coming out of the fuel line?

The timing belt could have jumped have you checked for codes yet? Also was the spark a nice blue color? Have you checked the compression yet?

It under the timing belt cover by the crankshaft so I would be sure its bad before you replace it. You can test it with a multi meter do you have one?

If you had one we could test it before you go thru all that work of changing it. Does your scanner read live data? If you clear the code does it come right back after trying to start it?

I would start by checking the wires to the crankshaft sensor for damage and check the sensor with a multi meter.