Hagia Sophia was built as a Christian cathedral and filled that role for 900+ years. It was then a mosque for 400 years or so. For coming up on 100 years it has been a museum.
If anybody has a right to be offended, it would be the Orthodox Christians who built it, not Muslims who stole it for a few centuries.
Unless they stole it fair and square.... like in Animal Farm all the animals are equal, but the pigs are just more equal.
And the sad thing is that the Orthodox Christians were on the verge of getting the Hagia Sophia (Church of the Holy Wisdom) back in 1878 until Queen Victoria permitted Prime Minister Disraeli to threaten war against the Russians if they dared try to help the Greeks get it back. (The British Empire helped Muslims against Christians for centuries, if doing so helped their own imperial and trade policy.)