2000 3.8 wont start

What have you done to rule out anti-theft? Does the PATS system "prove out" 3 seconds after initial key on?

Does the check engine light go off during cranking?

Have you confirmed an injector pulse with a "noid" light? Just having fuel pressure at the rail is not enough.

Does the motor "hit" on a small amount of starting fluid?

Here's some more information with things to check.

1996+ Crank with no start check list