I suggest you spend a little more time with the literal Hebrew in Genesis 16 & 17 so that you know a bit more about whom you are dealing with, as the verbal symmetries with the promises G_d made to Avram are astonishing. The angel said he would multiply Hagar greatly. Hagar called the angel G-d and worshiped him, but he did not tell her that he was not the Lord but a messenger. Hence, we know that the angel was Satan and that Islam isn't going away until the end as it was set up to be the adversary of the people of G_d from the beginning.
IOW scenario 2 is unlikely, yet we are to love our enemies while trying to convert them, resisting evil with love to the bitter end if necessary, placing our faith in HaShem.
As to logistical and military tactics, we've got it all wrong. The key was in the Sabbath for the Land.
6But Abram said unto Sarai, Behold, thy maid is in thine hand; do to her as it pleaseth thee. And when Sarai dealt hardly with her, she fled from her face.
7And the angel of the LORD found her by a fountain of water in the wilderness, by the fountain in the way to Shur.
8And he said, Hagar, Sarai's maid, whence camest thou? and whither wilt thou go? And she said, I flee from the face of my mistress Sarai.
9And the angel of the LORD said unto her, Return to thy mistress, and submit thyself under her hands.
10And the angel of the LORD said unto her, I will multiply thy seed exceedingly, that it shall not be numbered for multitude.
11And the angel of the LORD said unto her, Behold, thou art with child and shalt bear a son, and shalt call his name Ishmael; because the LORD hath heard thy affliction.
12And he will be a wild man; his hand will be against every man, and every man's hand against him; and he shall dwell in the presence of all his brethren
Hence, we know that the angel was Satan and that Islam isn't going away until the end as it was set up to be the adversary of the people of G_d from the beginning.
Now there I think that you are wrong. the Bible seems to say that it IS the angel of the Lord. There are no doubt various views about this angel, as there is about everything in the Bible. However, many evangelical Christian theologians consider that whenever the term "angel of the Lord" occurs, as opposed to just an "angel", that it refers to the pre-incarnate Christ.
I won't argue the Hebrew with you, as it is outside of my area of expertise. But that's my opinion, also.
However, you are undoubtedly correct, IMO, that Islam was set up from the beginning to be an adversary to the Lord. But the Arab peoples would also have had the free choice that God gives everyone.
I see nothing in the Hebrew or in the rest of scripture to support your contention.
For the sake of argument let's assume you are correct. Does it logically follow that the moslems are unbeatable because they are set up as the enemy of God's people? Obviosuly not. The nazis were the enemies of God's people. See many nazi's around today? Satan may stick around but the fools he uses are killed pretty easily.
Lots of people's have been set up as the enemies of Israel. Israel is still here and they are no more.
IOW scenario 2 is unlikely, yet we are to love our enemies while trying to convert them, resisting evil with love to the bitter end if necessary, placing our faith in HaShem.
Placing our faith in God does not mean we should not also be fighting against evil. I see no contradiction between praying for the salvation of the moslems and killing as many of them as we need to in order to provide for our peace.
As to logistical and military tactics, we've got it all wrong. The key was in the Sabbath for the Land.
You will need to expand on this as I haven't a clue what you are getting at.