One must realize that Islam, Judaism, and Christianity worship the
same God, but each after there own doctrines. This is where man has
'compartmentalized' God according to definition (webster), instead of
understanding that the Religion of God is Love (Matt22:37-40, James
1:27) according to scripture. So, then, this is why God can save those
who do not know the Word, but live it (love) according to their
conscience (Rom 2:14-15). But this is not the case for those who have
been enlightened by the TRUTH (Jesus Christ) thought the Holy Spirit,
but have rejected Him. I believe that any who truly seek the Lord will
be led to the Truth, which is Jesus, who is the Word, who was
concealed in the Old Testament, but reavealed in the New. This said,
Judaism and Islam are both false 'faiths', even though they
glorify God. Did not Jeus say that He would reject many who call
Him Lord? How much more than for those who don't? As Christians
though, we have compassion on all who are lost, not condemnors.
To answer your question concerning why the middle east is mostly
muslim (the way i see it by the Word and history), is that God's
people (the Tribes of Israel, 13 since Joseph's son were elevated
to 'son' status, where they really were Jacob's grandsons), were
taken away and dispersed into the world in their own time (the
Northern Kingdom +/- 450yrs before Judah in 70 ad) because they
rejected God. And the kingdoms which caused them to be carried
away brought in their own peoples or other peoples, and with them
their false religions. Of course, Islam did not appear until +/- 600
ad, but, because it is based upon other ancient writings, Moses
inparticular, it appeals to many. God, by rejecting men (because all
had rejected Him), but choosing to be the God of one man only,
who is Abraham, and showing Himself to the world by his family,
has made the world jealous for His Name. So, without God's chosen
people in the land (all 13 tribes, not just the 'Jew', who is a
descendant of Judah), the void was eventually filled with muslims.
I could be wrong in this because i don't know Islam, but i think they
claim the blessings given Abraham by God, through Ismael,
Abraham's first son.
But just as GOD prophesied and carried out HIs judgment to scatter
Israel for all their sins, He has fortold that He will unite them again
as one people (Ez36, and others). And now that the 'Jew' is
gathered there (Israel), we can be certain that we are much closer
to the day when all be gathered there. To be certain, the Jews are
not all Israel, but the 'Lost Tribes' will be gathered home, and then
shall Truth be throughout the Land.