2006 nissan x terra. spins over, wont start. replaced fuel pump assembly, crank sensor, left side cam sensor. not getting any cranking rpm from scanner. HELP !

Check to see if the headlights work! (Not high beams) if not replace the ipdm module under the hood, these cars are very famous for this issue

This already sounds all kinds of bad.
Lets start with spark. Did you verify it can make 30kv at all plugs while cranking? f you havent...start there. Do you have any codes in any modules? Engine, theft, trans, body?
Do you have vacuum cranking, do you have MAF reading cranking? do we know if its mechanically still in time? Did you do a cranking compression test? If you have spark, and you remove the fuel pump relay...does it start when it isnt flooding? What is your system and reference voltage...what is cranking vacuum? And what tests did you run that inspired changing all that stuff? Check the c ranking rpm in Generic mode just rpm onscreen, some OEM software doesnt update well during cranking, with one pid selected, solus should update better than 10x a sec, If you still have no signal...you need to measure the crank sensor wires or verify the crank sensor ring is even turning,