Actually, that reads:
Islam is (has been) destroyed.
To change the syntax to "must be" destroyed, I will have to consult my years of high school Latin books, unused for decades...
But I will be back...
There is an article I’ve read that is critical of the syntax. But that is how “CARTAGO DELENDA EST” is usually rendered. (There is no lower case in classical Latin either.)
And Cato the Elder never used those exact words. But it will do.