You mentioned the following:

Accordingly, the basic ‘blasphemous statements’ ― that arouse Islamic hatred for the Christian God ― are written in Arabic in the Dome of the Rock, in several forms and places, denying that God has a son.  In contrast, the Epistles of John declare four times that the antichrist spirit is an ideology that denies that Jesus Christ is the Son of God. This creed was first expressed in the 7^th Century during the Islamic Conquest, when the Dome of the Rock was built, and those ‘antichrist’ declarations were written in Arabic all around its walls. 

The Dome of the Rock

‘God is only one God. Far be it removed from His transcendent majesty that He should have a son.’ (Sura 4:171)  ‘There is no God but God.  He is one. He has no associate.’ (Sura 2:163)

Today, the Dome of the Rock still sits proudly in place on the Holy Temple Mount in Jerusalem.

I have wondered how those who subscribe to Supersessionism can consider that the LORD no longer cares about this abominable blasphemy, right where he had put his name?

This must have been an extreme provocation in the LORD's face, for over a thousand years.

It cannot go unanswered - it's like those daily blasphemies and challenges by Goliath.

Even those who cannot see a third temple in the scriptures, must still be incensed at this continuous blasphemy.

Thank you for reminding us all about that blasphemy, in Arabic, on top of the temple mount.