"So we changed the gargoyles into Rockmen. That is, as Kirk, Spock, and McCoy are running away, these huge twisted shapes break free from the rocks surrounding them and pursue the characters." William Shatner
Captain's Log: William Shatner's Personal Account of the Making of Star Trek V The Final Frontier
No mention of the pillars.
Furthermore, the shooting script indicates that the shaft of light containing the false God erupts from the core of the planet, and, post-torpedo, mentions a "gaping hole" where the light shaft had been.
245 INT. AMPHITHEATER 245
Smoke. Debris. The Cathedral is in disarray. An eerie
silence. Kirk, Spock and McCoy emerge from cover. The
enrgy shaft is a memory. In its place there is only
a gaping hole, glowing raw and red like a wound.
A rumbling sound from within the earth. The hole
throbs. It pulsates.
KIRK 246 KIRK, SPOCK AND McCOY 246
We've got to get out of here.
They haul ass up the side of the amphitheater.
246A ANGLE - THE HOLE 246A
Camera pushes in on the smouldering hole as a horrific
creature pulls itself out of the abyss -- a fire-
breathing monster made entirely of rock -- all that
remains of the evil entity. It spots the escaping
threesome and clambers after them.
Revised Final Draft
November 21, 1988
Sorry to be a stickler, but there are so many inaccurate account about these movies and shows that I feel it's important to be accurate.