I have a 1998 Kia Sephia automatic the gear shifts but I can push the car in any gear its not engaging, and will not start at all. What could be my problem.

Perform the tests below:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-11.html#post2123675