The short answer is NO. the long answer is again NO ,
They mainly have poached off of the Missionary`s of Christendom who have laid down the groundwork these past 2000 years in parts of the world where THEY have made inroads..
In what we call Christian nations today.
That is by far the majority of where their members have come from . And any converts that did come from a non christian background was converted in a christian country .
How much of mainland China have they witnessed to ?
How much of the nation of Pakistan have they witnessed to ? Saudi Arabia ? the land of India ? Afghanistan ? etc .
Any pro Muslim nation ? etc ?
NONE
Just to name a few examples .
So no, they have not fulfilled the scripture of matt.24 : 14