Spark, fuel and compression you need all three. You have to find out which one your missing. Pull out a spark plug and hold it against the engine while a buddy tries to start the jeep. do you see a spark, Yes/No. If you have a spark have a buddy try to start the Jeep while you spray starting fluid into the air cleaner or carb. Did it try to start, if so you have a fuel delivery problem. Check as to why your not getting fuel. If it didn't try to start check and log the compression in each cylinder.