That's okay

[little2add]

Pope Leo XIV visited the Blue Mosque in Istanbul today 

“The pope experienced his visit to the mosque in silence, in a spirit of contemplation and listening, with deep respect for the place and the faith of those who gather there in prayer.”

The Imam,  Asgin Tunca said he had invited Leo to pray, but the pope declined.

Speaking to reporters after the visit, Tunca said he had told the pope that the mosque was “Allah’s house.”

“It’s not my house, not your house, (it’s the) house of Allah,” he said.

He said he told Leo: “'If you want, you can worship here,’ But he said, ‘That’s OK.’”

[little2add]

Pope Leo XIV when asked why he didn’t pray in the Blue Mosque in Istanbul, said:

I would prefer to pray in a Catholic Church in the presence of the holy sacrament, he started his answer by referring to his press conference on the plane coming home, where he had explained to the press that his spirituality includes being aware of the presence of God at all times. 

I understood him to mean that he was probably praying, or at least aware of the presence of God, the entire time he was in the blue mosque. But did he want to perform a Catholic prayer in that space? 

That’s a different question. 

BTW, two previous popes who have visited Istanbul did pray in the Sultan Ahmed Mosque, Pope Leo chose not to and declined politely.