From then on such disputes would be handled privately and without murder and violence.
The Eastern rite churches did not sign on (since they weren't involved), the Jews weren't invited to sign, and the Moslems weren't involved either.
What we need to do is return to the princples underlying the Treaty of Westphalia and where an adherent of a religion that didn't sign on seeks to visit our countries they should be rejected.
Quite possibly a standard form could be created for this purpose, backed with personal peace bonds and so forth.
No doubt this would put the ACLU out of business in the United States while crushing the Wahabi efforts in Western Europe. Might even put a crimp on the Greeks.
A treaty? Have you read the koran?