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Be sure all the cables are good, and check to see if the security light is on or flashing. This can be a security issue not allowing power to the starter/solenoid. If that's the case, it would need to be diagnosed as to what function has failed, keys, etc.
ok, then we need to check for power at the starter/solenoid from the ignition switch.
check them both with key off and key on. you only need a test light, but if you have a DVOM, then you can measure the exact voltages.
ok, so the circuits are ok from the battery and ignition switch. check the small wire while cranking position. Why did you initially replace the starter and battery?
OK, this sure seems to be related to the security system at this point, and a scan tool would need to be used to isolate the problem now.
Great, check all the communications between all the modules to check for talking on the network, then check the security module for codes.