I can only speak for the ones that I know, and have asked...that is for economic reasons, a desire to live in America, and because they were born here.
As for God's will...I hope that we find out when we die.
It's fine if people want to immigrate here. We're a nation of immigrants.
But when the immigrants want to take over the system we have, and replace it, the line is drawn.
You can find quotes, I have one somewhere, going back to the early 70s. In fact, there was a quote by Boumedienne, the former president of Algeria, who said something to the effect: We will conquer your countries through the wombs of our women.
Moslems fully intend for the US to become an islamic republic. There have been numerous statements from them. The head of CAIR, whose name escapes me, said the exact thing several years ago.
The Dutch are waking up, but it may be too late for them. Their society has been heavily infiltrated. If we don't learn from them and the rest of Old Europe, we will fall the way they just may.