Ankh-Morpork Temple of Om
There is a temple to Om located on the Street of Small Gods in Ankh-Morpork. It is first mentioned in The Truth when it is visited by Mr. Pin & Mr. Tulip who need to raid it for robes to disguise themselves. Mr Pin very nearly strikes the elderly priest on the head with a silver candlestick, but is stopped by Mr Tulip who recognized the candlestick as a very valuable antique, and employed his fist instead.
The Temple is later used in Going Postal by Moist von Lipwig when he places prayers to the gods asking for a very large sum of money, visiting the temples of Om, Blind Io, Offler & Anoia (less of a temple, more of an office over the bookies on Cable Street). After this miracle had come to past the high priests of all four religions came to see the patrician and demand that Moist 'finding' a huge buried sum of money be acknowledged as a gift form their god, and to demand a tithe.