Muslims will not hesitate to occupy the Cathedral/Dom. Remember when they occupied the Church of the Nativity in Jerusalem about 15 years ago? They overran the monks who were in charge of the edifice - jointly held by the RC Church/Franciscans and monks of the Greek (I think) Orthodox church.
I remember it well. They broke a lot of artifacts and defecated on the floors. By the time they left, the edifice needed to be scrubbed like it was a hospital filled with vermin.
This will only stop when enough of the jihad preaching imams get dragged into the street and beaten to death. They are cowards who send their weak minded slaves out to do their dirty work. When they discover that they themselves will have to pay the price for their hate preaching, it will stop.