According to the following video, most of the mountains on Earth, especially the Mesas, were once giant trees that were cut or destroyed before they turned into stone.

Target suggestion:

How did the so called Devil's Tower in Wyoming look in the past, and how did it form?

https://en.wikipedia.org/wiki/Devils_Tower

If it once was a giant tree, was it cut, how was it cut, and who cut it?

How did the petrification happen?

It is very simple:
https://en.wikipedia.org/wiki/Columnar_jointing
This has never been a tree. If it would have been, there should be certain petrified wood features also be visible like torus and porus, lenticels etc. The tracheids (the cells transporting the water) can only be max 9 m long, if it would be more, then the water column would tear because of gravity. And they are single cells. The tree has to suck up the water to the crown by the suction force of the leaves. There are physical limits for this.

Compare with the tower and you will see: the video is full of BS.
The maker has neither a smallest clue about geology nor about dendrology.
This is just the inside of an intrusion (simplyfied:like a volcano) of hard rock in a softer surrounding rock which has been eroded and washed or blown away over time.
https://www.nature.com/articles/s41467-018-03842-4
A tree has roots. Where are they? -Oh they have not been petrified...

Elemi i believe it is covered in wood, i saw a video where people are taking pieces of tree wood from there, and apparently its not the same tower that exists. i'll try to find the video to post in here.

The Devil's Tower covered in wood? And it is not the same tower that exists? And that is in a video? Wow. Sounds absolutely credible to me in the first place ...

@Elemi

"the video is full of BS"

Whoever made the video is so sarcastic that it hurts, but the mentioned possibilities are still interesting. I don't know what's true and are open to what remote viewing reveals.

"The tracheids (the cells transporting the water) can only be max 9 m long, if it would be more, then the water column would tear because of gravity."

Assuming that gravity back then was the same as today.

"A tree has roots. Where are they? -Oh they have not been petrified..."

How do you know? Is there no rock in the ground?

The columns are 180m tall, even with the growing earth theory this is a bit much. The "roots" should be visible above ground if one does not ignore geology completely, There is a river valley nearby. A big tree (we are talking about a kilometers high tree!) needs very big and long roots. Can you imagine the suction force needed to bring the water up this high? We are talking about hundreds of atm. We use the best steel to deal with such high pressures. We do not construct our submarines with timber...

Yes, it's simply a geologic feature.