BCE - Abbreviation for "Before Common Era" which coincides with BC (See Richard Carrier on this subject)
Blather - collective noun for a group of theologians
CE - Abbreviation for "Common Era," which coincides with the Christian era or AD (see Robert R Cargill on this subject)
CLOOB - Complete Load of Old Bollocks (copyright Tony Youens)
Conservative - an individual with atrophied empathy
Deepity - Deepity is a term coined by Daniel Dennett in his 2009 speech to the American Atheists Institution conference. It refers to a statement that has (at least) two meanings; one that is true but trivial, and another that sounds profound, but is essentially false, or meaningless with respect to this deeper meaning, but would be "earth-shattering" if true. Source - Rational Wiki
Devout - deranged, possibly dangerous
Dog Ma - a bitch
Ex recto - from the fundamental orifice
Faith - Unsupported belief. It is useful to replace the word faith in any context with this handy alternative.
Female Circumcision - Female genital mutilation
Honor Killing - familial murder
Montel Williams - Unprincipled jerk
Psychic medium - a ghoul
Religion - Organized superstition
Spiritual Leader - theocratic dictator (coined, I think, by Ophelia Benson)
Theology - "The study of theology, as it stands in the Christian churches, is the study of nothing; it is founded on nothing; it rests on no principles; it proceeds by no authority; it has no data; it can demonstrate nothing; and it admits of no conclusion." Thomas Paine
"Theology is never any help; it is searching in a dark cellar at midnight for a black cat that isn't there." Robert A Heinlein
"For centuries, theologians have been explaining the unknowable in terms of the-not-worth-knowing." H. L. Mencken
Weasonableness - There is reasonableness then there is its slimy evasive counterpart, weasonableness. A Fuddism.