[nanetteclaret]

The architect could have used any shape with straight lines and we would not be having this discussion. He did this on purpose.

[wildandcrazyrussian]

I think if there IS a crescent in the final design, it should be incorporated in the following manner, as lots of Russian Orthodox churches have done since Ivan the Awe-Inspiring ("Terrible") conquered the Islamic city of Kazan in the 1580's and removed the centuries-long threat:

Here

as a symbol of the triumph of Christianity over Islam.