[Gritty]

One thing’s for certain, Christians won’t be erecting any banners in Mecca.

That's for sure.

If one did manage to do that, how would the Mohammedans react?

I think we all know the answer to that.

[Will88]

“I think we all know the answer to that.”

I guess an equivalent to:

“Allah has no son”

would be

“Mohammed was a false prophet”

Yep, I think the reactions would be drastically different to such banners unfurled before the followers of each faith.