Because God was never in a marital (covenantal) relationship with Islam.
It's important to understand how ancient marriages worked. There were 2 parts:
1.) the betrothal
2.) the wedding
In both parts the man and woman are considered legally married, even though the wife does not live with the husband during the betrothal. If a man and woman were betrothed but had not yet had their wedding feast, and they wanted to separate, they would still have to file for a divorce. It wasn't until after the marriage ceremony that they would live together.
Additionally, during the betrothal, the woman could not be with another man, as this would be considered adultery.
The point being that being betrothed, but not yet living together, a man and woman were considered legally married.
Now with that being said, it is easy to point out the husband in revelation:
Revelation 19:7
Let us rejoice and exult and give him the glory, f
or the marriage of the Lamb has come, and his
Bride has made herself ready;
Revelation 21:9
hen came one of the seven angels who had the seven bowls full of the seven last plagues and spoke to me, saying, “Come, I will show you the
Bride, the wife of the Lamb.
The husband is obviously Christ, who is God himself.
Israel was the chosen bride who was first invited to the wedding feast, but they rejected it and killed the servants sent to them by the Father. So the Father destroyed them and sent out invites to the wedding feast so many others who would come. Matthew 22:1-14
Matthew 8:11
11I say to you that many (gentiles and remnant Israel) will come from the east and the west to share the banquet with Abraham, Isaac, and Jacob in the kingdom of heaven.
12But the sons of the kingdom (unfaithful Israel) will be cast into the outer darkness, where there will be weeping and gnashing of teeth.”
Egypt, Assyria, Babylon, Rome....
Ezekiel16: 26-29
ou also played the harlot with the
Egyptians, your lustful neighbors, multiplying your whoring, to provoke me to anger.
27Behold, therefore, I stretched out my hand against you and diminished your allotted portion and delivered you to the greed of your enemies, the daughters of the Philistines, who were ashamed of your lewd behavior.
28You played the harlot also with the
Assyrians, because you were not satisfied; yes, you played the harlot with them, and still you were not satisfied.
29You multiplied your whoring also with the trading land of
Chaldea, and even with this you were not satisfied.
John 19:15
Shall I crucify your King?” Pilate asked. “
We have no king but Caesar,” replied the chief priests.