From what you describe here it sounds like the timing chain has slipped. That is why it backfired, the compression is low, and you can’t start it now. If you aren’t getting spark then I’m not sure what to say about that except to make sure the ignition is getting power to it.
Since you say that your alignment procedure is setting things up to cylinder #4 TDC then the rotor should be pointing to the wire position for #4 cylinder.