I tried your suggestions darth_trethon,
I was able to lock pick that door but when I talk to the immaculate guy he gives me the same dialog he did when I was at his chapel. I even went through the trial by by glitching with they pyramids but it didn't register as being completed.
my question is do I need to complete this quest to proceed in the game? (I was able to pickpocket his keys at least)
Not sure why that is? The guy should tell you to go kill a chicken and make a blood stone to cure yourself when he realized you're already cured of the rot and tells you to wait. He then leaves and comes back with a bunch of immaculate guys to kill you.
I got through just fine without completing the trials at all. Or rather I did them in reverse with the pyramid and was never infected with the rot. Have you made sure your whole party was cured of the rot? The star stone should heal your whole party when it does its light show.
