The radio will work at voltage levels far below what is required for the relays to activate (for the fuel pump, etc.).

Run a quick voltage check on battery, at least as a first step to diagnosing this issue.

I can think of many things that could potentially give the symptoms that you describe.

Start with some basics.

Are you getting fuel to the injectors? Is the spray pattern consistent and the same for both injectors?

Are you getting spark to the plugs? All the plugs?

If it passes both those tests, do you have compression? If so, then you have all three requirements for the engine to run, but they have to happen at the right time. So now you are down to timing issues.

I am not trying to be condescending. You need to start diagnosing the basic systems to try to isolate the problem.