Assume this was a valid scientific experiment, then there has to be some combination of a reasonable number of written words that would prove they had communicated with the divine.
People have been writing texts for thousands of years and it's obvious to me that no such word combos exist. If they did, they'd have been discovered and well-known.
So, all that was shown with the walls experiment was that experimental design was flawed. Nothing about whether the person could or could not speak to God on LSD.
Due to the nature of higher powers and quantum randomness, I don't believe there's an algorithmic way to distinguish acts of God from acts of an Alien from happenings of extremely improbable (out-of-distribution) quantum randomness.
People have been writing texts for thousands of years and it's obvious to me that no such word combos exist. If they did, they'd have been discovered and well-known.
So, all that was shown with the walls experiment was that experimental design was flawed. Nothing about whether the person could or could not speak to God on LSD.