Thomas:

CBY quoted from Josephus as follows:
And this very thing it is that principally creates such a wonderful agreement of minds amongst us all; for this entire agreement of ours in all our notions concerning God...

You responded:
He does not mention the idea of the complex or absolute unity of God and so you can't use this passage to support your claim that such an issue was not a point of consideration to Jews of his day.

I would like to point out that while Josephus doesn't mention this specifically here, he does assert that there is complete agreement among Jews of his day concerning all notions about G-d. Now, look at Philo, who was well known to Josephus (cf. Antiquities xviii.8, 1; comp. ib. xix.5, 1; xx.5, 2), and you will see an explicit statement that G-d is a SIMPLE not complex unity:

"G-d is alone, a unity in the sense that His nature is simple... (Legum allegoriae II:1-3)

So, logically, when Josephus writes this, this wonderful accord among Jews corresponds to what Philo asserts - namely, the absolute simple unity of G-d.