Why did the Christians never win a war against the Turks?

First, the Ottoman Turks occupied the Balkans and parts of Europe. They occupied Constantinople and turned the Hagia Sophia Church into a Mosque. Then (again the Ottoman Turks) they established a system called the Devşirme System and forcibly took children from Christian families and made them fight. Also, in the first years of Turkey's establishment, Turks committed genocide against Armenians (they killed 2 million Armenians) and threw thousands of Greeks into the sea. They also invaded Cyprus and killed the Greeks, and the Turks captured half of them.

Why did the Christians never win a war against the Turks?
Why did the Christians never win a war against the Turks?
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