Hello and thank you for your post. I am a master certified GM tech, with 15 years Saturn experience,and can help you to resolve your issue.
have you ever had the body computer AND engine computers scanned for codes?
you may just have a faulty ignition sensor.
to bypass the security sensor requires the installation of a resistor in the wire which if not done properly can lead to repeated no starts as well.
the resistor is also called a bypass module
it is part of a remote start system.
that will run you around $400 installed professionally and you will never be able to use your key to start the vehicle... where the security sensor will run you about the same.
a new bcm is like $700.