Not disputing that.
Christianity started in the middle east, but has been European/American primarily ever since, the evangelisation of the west was a VERY long time ago now. (hence why the Vatican is in Rome

). For the sake of argument we'll say Catholism, which has had a groundworks in Europe/America for a long time and hence will have land to sell, accumulated wealth etc. (Though the child abuse has reportedly nearly bankrupted the church

)
Point b, I know its extremely prevelant, from the first country to adopt islam (Somalia) to the iron grip it now has on a block of countries, not to mention its rapid inroads in western societies through immigration and high birth rates.
However the point stands that it was not until recently that islam was practically unheard of in western societies, certainly not to the point of position and power in influencing votes as they do now.
Which ties in with my last point, your suggestion that other countries are financing such ventures. Surely there has to be a degree of suspicion attached? Saudi Arabia is notorious for pouring billions into western countries, a clear attempt to islamify them. Just look at Saudi Arabia to see what their vision is.