Mazda MP3 won’t start, help

2002 Mazda MP3. Changed my rear engine mount. All I did was unhook the wiring harness and remove the throttle body and battery. Now the car won't start. Any ideas?
2003 protege 5
Need more details. Is there power inside the car? Does it turn over or try to start? Did you check the battery lugs are snug and all the fuses both inside the car and under the hood aren’t blown?
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