Wow, I am sorry to hear you have done all this and it still doesn't start. Based on this, it sounds like you need a professional diagnosis before you spend any more money. You have probably replaced a lot of items which didn't need to be.I’ve replaced battery, starter relay, starter, alternator, camshaft sensor, crank sensor, ignition switch, ignition switch actuator pin, checked all grounds and all that happens is clicks in the rear fuse box. Any suggestions?
Are you sure that it doesn't have anything to do with the security system (immobilizer or other system)? Perhaps that is stopping the car from starting.