[mturmon]

Sure. As a non-theist, I was just goofing around with the concept of "there is no got but God" being logically equivalent to the proposition:

(∀ god) (god == God)

which is trivially satisfied if there are no gods. Over-dry humor, I know.

[credit_guy]

That's a good one. In other words, if you state "I declare there is no deity worthy of worship but Allah", you leave it entirely possible that Allah itself doesn't exist. The follow up that "Mohammed is his messenger" is not a contradiction either.