There's not much competition in the Middle East among Christian groups.
However, where else is there zero competition?
I've got an excellent feel for Europe. Plenty of competition showing their wares throughout the continent, some places less than others.
Africa, Asia, and S. America are the centers of great Christian expansion, and that expansion is broad rather than narrowly concentrated in one denomination.
I think perhaps I'm the one with the clear view.
The vast majority of Europe is either Catholic or Lutheran or Orthodox. A handful of American-style denominations/congregations started up in the past 30 years is not a "marketplace".
Africa, Asia, and S. America are the centers of great Christian expansion, and that expansion is broad rather than narrowly concentrated in one denomination.
S. America/Central America has been all-Catholic for 500 years. Its humorous to see you term the recent invasion of American Evangelicals "great Christian expansion". Your true colors shining through.
In east Asia, there is real competition in S. Korea and parts of China. Most Asian Christians are in the mostly Catholic areas of the Philippines and India, as well as in Vietnam.
Africa is bifurcated between nations where most Christians are Catholic (French, Belgian, and Portuguese colonies) and nations with your marketplace (a number of former English colonies).