Full Idea
I am inclined to think that almost all philosophers in late antiquity were monotheists.
Gist of Idea
In late antiquity nearly all philosophers were monotheists
Source
Michael Frede (A Free Will [1997], 08)
Book Reference
Frede,Michael: 'A Free Will' [Univ of California 2011], p.143
A Reaction
I'm not sure when late antiquity begins, in this remark. Maybe as early as 100 CE. Epictetus talks of Zeus as if he is supreme.
Related Idea
Idea 23332 Zeus gave me a nature which is free (like himself) from all compulsion [Epictetus]