My 2002 Monte Carlo will not start it has brand new everything that I know to replace to do with start everything checks out good what the hell could this be

With a plug wire removed from coil while helper is cranking engine - HOT SPARK should jump to metal ground that’s close by - system capable of 60,000 volts ((60kv) Is the security light on in dash? Got fuel injector pulse - testing with noid light ? I’ll say you ain’t got sufficient SPARK ! There is one more possibility - you’ll need to reply with spark test first... IF you want more info.