Yet more evidence that Islam is in fact a perversion of the one true faith introduced into the world by Satan.
Thank you to Venomous Kate for the link.
Calculus: (Latin) - a pebble; a small stone.
Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ. - 1 Peter 2:5