Thanks Ambarsaria ji.
SPNAdmin's question was, at what time in history were non-Muslims prohibited from entering Mecca. The example given was to give a ball-park idea that they were definately excluded at 1503 since someone was recorded as sneaking in. So it wasn't in the last 200 years, for instance.
It is true that I asked that question. However, I did not play all of my cards in this discussion at one time. It has always been apparent from the very start of the thread the following:
If Mecca was closed to non Muslims when Guru Nanak was a visitor,
And...if Guru Nanak found his way there,
Must we conclude one of the following:
A. He sneaked in and his identity was not discovered.
B. He was actually a Muslim.
A does not satisfy our need to know how it is that Guru Nanak was not discovered as a non muslim, or why the Qazis let him preach once he arrived at the center, even after "the mosque turned." (Another specious story whose point is nearly often missed and whose parallel narrative in Hindu philosophy and history is nearly always ignored.)
B would explain why Guru Nanak was not seized, arrested, or thrown out. It also satisfies why he was permitted to preach and was even scolded. B suggests that people though he was a muslim. B also represents the conclusion "we are supposed to draw"... when we are unaware that this is a trolling exercise that is used to rile the forum and perpetuate unnecessary and venomous discussion, that hurts Sikh religious sentiments and undermines Sri Guru Granth Sahib Ji.
Being able to date the times in history when Mecca was closed to non muslims helps us see how the question of the thread can become a tool in the hands of fanatics.