Ghazali,
ἐν οἷς ὁ θεὸς
En Hois Ho Theos
So it is not "Ton Theon" but "Ho Theos", and i agree it is used for YHWH, what i want to say is that we should take the epistles into context first otherwise we can use the same logic in the old testament and say it contains blasphemy because humans are called Elohim and i'm pretty sure you know that Elohim is used for YHWH as well...or a better example is John 20:28 which can cause confusion, so it's all a matter of context..