i hear ya man i prayed when my grandad was on his deathbed it didnt do notin to him but it helped me. im sry to hear about ur grandad man i know u wasnt tryin to be disrespectful and u wasnt. its just best to try to be positive if not for urself then for others man.

im sure you have faith deep down its just your faith has been tested many times. He's there when you need him man