The question is “Can someone think that the pyramids could be a grain storage silo?” Some could and some could not. Could someone believe Moses parted the Red Sea? Some could and some could not. Biblically, I believe in the Red Sea parting but not the pyramid grain storage, but I’m sure their are people who would laugh at either scenario.
Only a moron could look at the tiny amount of open space inside the Great Pyramid and think that it was designed to store wheat. The idea is just patently absurd.
Its like snake handling.
I’m not going to concern myself with their faith and I have faith that if I don’t pick up a snake, it won’t bite me.