Neither shall he regard the God of his fathers

Stop point: 59:10

A solemn oath to extirpate heresy was taken, in the great cathedral where, nearly three centuries later, the "Goddess of Reason" was to be enthroned by a nation that had forgotten the living God. Again the procession formed, and the representatives of France set out to begin the work which they had sworn to do. At intervals along the homeward route, scaffolds had been erected for the execution of heretics, and it was arranged that at the approach of the king the pile should be lighted, that he might thus be witness to the whole terrible spectacle. The details of the tortures endured by these witnesses for Christ are too harrowing for recital; but there was no wavering on the part of the victims. On being urged to recant, one answered, "I only believe in what the prophets and apostles formerly preached, and what all the company of the saints believed. My faith has a confidence in God which will resist all the power of hell." {GC88 229.2}

Neither shall he regard the God of his fathers

The video implies that we are looking back on the Papal fathers which I don't think is the case.
I think this means going back to the original Fathers.

For they went and served other gods, and worshipped them, gods whom they knew not, and whom he had not given unto them: (Deut­ 29:26)

They sacrificed unto devils, not to God; to gods whom they knew not, to new gods that came newly up, whom your fathers feared not. (Deut­ 32:17)

The Fathers I believe are Abraham, Isaac, and Jacob.
This is who you compare yourself to, not the ones that were mixed up in paganism themselves.
Was the destruction of Jerusalem in Jeremiah's day just from the current Kings?
It was about 400 years since Rehoboam who forsook the law of the LORD.
Then came many evil kings after that.

Thus saith the LORD of hosts, the God of Israel; Ye have seen all the evil that I have brought upon Jerusalem, and upon all the cities of Judah; and, behold, this day they are a desolation, and no man dwelleth therein, Because of their wickedness which they have committed to provoke me to anger, in that they went to burn incense, and to serve other gods, whom they knew not, neither they, ye, nor your fathers. (Jer­ 44:2-3)

You could not say this if your comparing the current Kings to previous Kings.
Many of the previous Kings served and worshiped other God's just as in the time of Jeremiah.

The thing that hath been, it is that which shall be; and that which is done is that which shall be done: and there is no new thing under the sun. (Ecc­ 1:9)

The first Atheist I can find is Diagoras of Melos who was some Greek philosopher going back to the 5th century BC.