he/she is called an imam
The Islamic House of Worship is called a Masjid (Mosque) not church.
The Esperanto words for church and mosque are pregejo and moskeo.
A mosque
No, the Blue Mosque was never a church, being built as a Mosque by Sultan Ahmed I. The Hagia Sophia was an Orthodox patriarchal basilica and later became a Mosque. It is now a museum.
Muslims do not go to church. They go to mosque. They don't have to do anything before they go to a mosque.
A mosque is a church where Muslims go to profess their beliefs in Islam.
Before becoming a museum, the Hagia Sophia was a house of worship. It was first a Christian church and then became a Muslim mosque.
That depends on the mosque. Usually there will be Korans in there, but it is largely up to the mosque.
A mosque is the building that people of the Muslim religion use to worship in as Christians do in a church.
Pray.
Apse
A mosque is an Islamic house of worship, like a Christian church or a Jewish synogogue.