Poland already did this year.
From the New American:
In the presence of Polish President Andrzei Duda and other top officials from both church and state, Jesus Christ was officially recognized as the King of Poland in a Catholic ceremony. Declared to be Poland's Lord and Savior, the Messiah was asked to rule over the Polish nation, its people, and its government. The ceremony was held last month at the Church of Divine Mercy in Krakow and then repeated at churches across Poland, marking the 1050th anniversary of the nation's Christianity. The congregation also renounced the devil and all his evil works.
Of course, as more than a few church leaders pointed out, the ceremony did not actually “make” Christ the King of Poland. That is because, in the Christian worldview, Jesus Christ is already King of kings, as well as King over all His creation. So, instead of actually “making” Jesus the King, the Polish ceremony enthroning Christ recognized that sovereignty, with the formalities being described by officials and celebrants as a sign of the willing submission of Poland and its people to the rule of Christ. The ceremony was also not intended to, and could not, add to Jesus' honor or power, religious leaders cautioned. Throughout the mass, though, Christ was asked to rule over every aspect of Polish life.
The people and their leaders prayed for Christ to reign. “Immortal King of Ages Lord Jesus Christ, our God and Savior! In the Jubilee Year 1050 anniversary of the Baptism of the Polish people, in the Extraordinary Jubilee of Mercy, here we Poles bow our heads before you, King of the Universe, together with the authorities, clergy and laity, to acknowledge your reign and dominion over Poland, those living in our homeland and throughout the world,” Poland declared at the ceremony. “We surrender to Thy law, entrust and take you to our homeland and the whole nation.... We confess before heaven and earth, that your reign we need.... Wishing to worship the majesty of Thy power and glory, with great faith and love, we cry out: Rule us Christ!”I don't expect them to be getting sharia law any time soon.