Sultan of our nation?

With Islam increasingly becoming the dominant religion of our country many of our government officials, nobles and other notables, have begun to adopt Islamic notions of kingship, Arabic names and titles. Many have in fact started to refer to our ruler as a Sultan, even though our official state religion is still our religion. Some advisors of our ruler now suggest that it might be prudent to go along with this. If we start referring to our own country as a sultanate, it might ease relations with the many Muslim countries around the world.