Just because you cant explain it doesnt mean its a miracle. In the beginning was the Word. & the Word was: Hey you!" This is the Discworld after all & religion is a controversial business. Everyone has their own opinion & indeed their own gods of every shape & size & all elbowing for space at the top. In such a competitive environment shape & size can be pretty crucial to make ones presence felt. So its certainly not helpful to be reduced to appearing in the form of a tortoise a manifestation far below god-like status in anyones book. In such instances you need an acolyte & fast: for the Great God Om Brutha the novice is the Chosen One
- or at least the only One available. He wants peace & justice & brotherly love. He also wants the Inquisition to stop torturing him now please..."