And when you say Theos you refer to chief god of Greek polytheism....
No. The chief god of Greek polytheism was named Zeus, not theos.
"O God most glorious, called by many a name,
Nature's great King, through endless years the same;
Omnipotence, who by thy just decree
Controllest all, hail, Zeus, for unto thee
Behoves thy creatures in all lands to call.
We are thy children, we alone, of all
On earth's broad ways that wander to and fro,
Bearing thy image wheresoe'er we go.
Wherefore with songs of praise thy power I will forth show.
Lo! yonder heaven, that round the earth is wheeled,
Follows thy guidance, still to thee doth yield
Glad homage; thine unconquerable hand
Such flaming-minister, the levin-brand,
Wieldeth, a sword two-edged, whose deathless might
Pulsates through all that Nature brings to light;
Vehicle of the universal Word, that flows
Through all, and in the light celestial glows
Of stars both great and small. O King of Kings
Through ceaseless ages, God, whose purpose brings
To birth, whate'er on land or in the sea
Is wrought, or in high heaven's immensity;
Save what the sinner works infatuate.
Nay, but thou knowest to make the crooked straight:
Chaos to thee is order: in thine eyes
The unloved is lovely, who did'st harmonise
Things evil with things good, that there should be
One Word through all things everlastingly.
One Word -- whose voice alas! the wicked spurn;
Insatiate for the good their spirits yearn:
Yet seeing see not, neither hearing hear
God's universal law, which those revere,
By reason guided, happiness who win.
The rest, unreasoning, diverse shapes of sin
Self-prompted follow: for an idle name
Vainly they wrestle in the lists of fame:
Others inordinately Riches woo,
Or dissolute, the joys of flesh pursue.
Now here, now there they wander, fruitless still,
For ever seeking good and finding ill.
Zeus the all-beautiful, whom darkness shrouds,
Whose lightning lightens in the thunder clouds;
Thy children save from error's deadly sway:
Turn thou the darkness from their souls away:
Vouchsafe that unto knowledge they attain;
For thou by knowledge art made strong to reign
O'er all, and all things rulest righteously.
So by thee honoured, we will honour thee,
Praising thy works continuously with songs,
As mortals should; nor higher meed belongs
E'en to the gods, than justly to adore
The universal law for evermore."
-Cleanthes, 2nd Century BC