2) By ending his speech with the bible quote, he is telling the Muslim world that "we know what your ultimate goal is and we will not let the Christian world be taken over."
The "Judeo-Christian" world would be a better phrase here. He was quoting from Deuteronomy, which is the last book of the Torah.
You are quite correct.
I love it when you talk "Bible" to us. You make it come alive. :-)