Until the Protestant Reformation, Christianity meant the Catholic church and it did not exactly distinguish itself. Crusades were like Jihads. Let us not confuse today's situation with the entire history of Christianity.
The Crusades were wars to resist jihad and to recover the regions lost to Islam after 632. The first came after the Turks had overrun almost all the Christian Byzantine empire. They failed because after the Fe=rabkish armies had taken over the leading cities of Syria, including Jerusalem, the alliance between them and the Byzantines broke down, and Crusader states were set up which refused to accept the authority of the Emperor. This led ultimately to the tragic Fourth Crusade, which destroyed the Byzantine empire, or reduce it to a shell of itself. So, the Crusades were religious wars like the ones of the 16th and 17th Century which shattered Christian unity. They failed, leaving Southern Eastern Europe to invasion and conquest by the Ottoman Sultans, who not only conquered Constantinople but led armies to the gates of Vienna. As Luther loudly led a German Rebellion against the Holy Roman Emperor and saw the Turkish invasion as a judgement against the West—which in a way it was, a judgement against schism and disunity in the Church—The Emperor Charles managed to hold onto Vienna. Not for another generation, after the Turks were defeated at Lepanto, was the Turkish advance halted. Not until 1876, was the Turkish conquest of Southeastern Europe reversed and the Christian peoples given their freedom.