"Separation of church and state" is paraphrased from Thomas Jefferson and used by others in expressing an understanding of the intent and function of the Establishment Clause and Free Exercise Clause of the First Amendment to the United States Constitution.
The German Empire and Austria-Hungary were Allied within the Central Powers, So I assume it was the German Empire in this case, Which Declared war on Russia and France and was at war with Britain due to the Invasion of Belgium.
So the Answer is the German Empire.
They were desperate, despairing
and, urge and desire the need for the Muslim to rule saying, “We like your rule
and justice far better than the state of oppression and tyranny in which we
were. The army of Heraclíus we shall indeed… repulse from the city”. They
wanted and favored the justice and system of the Muslims instead of the
Byzantine’s. In which case, this case the Muslim’s won the battle and the Hims
started to welcome them into their gates.