This is an impressively irrelevant calculation, regardless of whether or not GPT did the arithmetic correctly. If you want to calculate something similar but actually useful, you could get a list of all "cathedrals" dedicated to st michael, find the line for each combination of 2 cathedrals, and then calculate the probability that 5 more also fall on that line.
But it turns out that we don't even have to go that far. The line found in TFA is about ~50km wide. Any given 50km wide line covers approximately 1% of europe's area. There are allegedly 800+ locations dedicated to st michael in the UK, so let's make a conservative estimate and say there are ~1000 in all of europe. This means that in any given 1% of europe's area, there are on average 10. Therefore literally any 50km wide line that crosses a substantial portion of europe has a solid chance at having 7 or more st michael dedications in it.
Edit: actually via a generalization of the pigeonhole principle, if we assume that europe is 3000km tall and contains 1000 sites dedicated to st michael, there must exist at least one 50km band that contains at least 17 sites.
But it turns out that we don't even have to go that far. The line found in TFA is about ~50km wide. Any given 50km wide line covers approximately 1% of europe's area. There are allegedly 800+ locations dedicated to st michael in the UK, so let's make a conservative estimate and say there are ~1000 in all of europe. This means that in any given 1% of europe's area, there are on average 10. Therefore literally any 50km wide line that crosses a substantial portion of europe has a solid chance at having 7 or more st michael dedications in it.
Edit: actually via a generalization of the pigeonhole principle, if we assume that europe is 3000km tall and contains 1000 sites dedicated to st michael, there must exist at least one 50km band that contains at least 17 sites.