Source : Webster's Revised Unabridged Dictionary (1913)

Atheize \A"the*ize\, v. t.
   To render atheistic or godless. [R.]

         They endeavored to atheize one another.  --Berkeley.

Atheize \A"the*ize\, v. i.
   To discourse, argue, or act as an atheist. [R.] --
   {A"the*i`zer}, n. --Cudworth.