Brian Fischer, who presents Focal Point on the American Family Radio Network, has published a blog ahead if what's expected to be the most observed and most photographed eclipse in history.
The movement of the moon between the Earth and sun will produce a dramatic event in the US, where a total eclipse will turn day to night for two minutes.
In his article, Fischer said it is evident God had this message planned.
"God knew that this precise event would come at this precise moment in our nation's history, and it is entirely appropriate for us to ponder its significance," he said.
"The path of this total eclipse of the sun is remarkable, in that it crosses over the entire continental United States, almost perfectly bisecting America from the Northwest to the Southeast.
"And in that path, the sun will be perfectly blotted out, by the ruler of the night, plunging all of America in its path into virtual total darkness."
Speaking of it's significance, he said: "This is a metaphor, or a sign, of the work of the Prince of Darkness in obscuring the light of God's truth.
"Satan, and those who unwittingly serve as his accomplices by resisting the public acknowledgement of God and seeking to repress the expression of Christian faith in our land, are bringing on us a dark night of the national soul.
Talking about the need for the US to change its ways, he said: "We must fight the darkness that we may return this nation to an unapologetic acknowledgement and embrace of the God of the Founders and his transcendent standard for human behaviour as enshrined in the Ten Commandments.
"It is through these two classic, foundational American ideals - reverence for God and for his standards for life - that we can reclaim this land from spiritual darkness.
On British shores, only south-west England and South Wales are expected to have any chance of witnessing the moment through a break in the cloud.
The Royal Astronomical Society warned anyone hoping to catch the phenomenon not to look directly at the sun.