Having spent the last two years in Saudi Arabia, it is interesting to see the symbols of Christian history (past & present) in Istanbul. No other religious practice or places of religious worship, other than those of the Islamic faith, are permitted in Saudi Arabia. Turkey has mosques and churches and synagogues for all to worship as they please.
There is much debate in the Islamic world at present about the direction that Islam will take in the future – the more fundamentalist Saudi way or the more secularist Turkish way. Saudi Arabia, with no tolerance of music, theaters, cinema, women drivers, other religions, and much more, has one of the highest viewership of YouTube in the world. So it looks like the next generation of Saudis are already turning away from the ways of their more fathers and grandfathers and we know which direction the wind is already blowing.
To display any of the below in public or to be caught with them in Saudi Arabia would be to risk jail or worse.