Just take a look at the BibleHash algo and how much estimated memory it would take to load the KJV array in the GPU executing environment (this is from kjv.cpp), and tell is if you believe its technically possible to duplicate the chained bible hash calls, the AES512 call, the hash call and the concatenated result call in a GPU. And how secure or not secure you feel that someone will figure it out knowing what you know about c libraries and GPU code programming.
Im not too worried about ASIC, I heard they have such limited memory that loading the bible in it would be preposterous also you need a specific designed chip with the bible that would cost a lot of R&D for the first batch.
Edit: btw guys when you execute one biblehash, it uses 33,000 verses of the bible in a certain hashed order (depending on each hash its different). IE its memory intensive since the entire bible is memorized.
I think it's possible, look at the memory requirement for cryptonight or ethereum, it may have a performance hit due to the extra pieces.
ASIC's are possible, but not anywhere near cost effective (half a million R&D?)
possible, let me e-mail you that reason and then please post if you believe it is not advantageous/feasible to port biblepay to GPU.