Symptom diagnostic will get you no where... you need to know WHY it wont start. An engine needs Compression, Fuel, Ignition, and in proper timing to accomplish a kaboom... there is any one of 1000 reasons why a jeep wont start and without knowing what is missing from the equation, well, take your pick
Having said that, as others have mentioned, if you used crappy aftermarket parts, don't scratch ANY part you have replaced off the list of possibilities, the biggest problem for a DIY parts exchanger is the dreaded price shopping... since you don't KNOW this is the problem, we will get the cheaper option, bad idea.
I had a 1996 ford F150 towed in for a no start, it had a refurbished pcm, new distributor, 3 sets of plug wires were put on it, new relays, new ignition module, coil, spark plugs, crankshaft position sensor, the aftermarket alarm had been ripped out from under the dash and removed... Well after testing all that I could to determine why there was no fuel OR spark command, I plugged his OE ignition module back in and got spark and fuel but still no start... who knows the order in which he replaced parts but at the end of the day, the ignition module that was brand new didn't work and was just one more thing to diagnose.
Follow up with some details for some better suggestions!