Then there must not have been a single Christian in Europe for the duration of the Crusades.
Quite a few people in Europe were quite skeptical of the (radically new in the 11th century) idea of an armed pilgrimage as a penance, and the Church held fast to its doctrine opposing conversion at swordpoint in most encounters with Muslims and Jews in the Crusades (and, usually, after initial slaughter, they the Crusader states in the Levant didn't make any attempt to convert local Jews or Muslims at all, though they did try to bring local Christians into communion with Rome). Exceptions of course include some elements in the Baltic Crusades (against pagans who were neither Jewish nor Muslim), and of course the Albigensian Crusade (except the victim in this case were heretical schismatic Christians, not pagans, so bringing them "back into the fold" was considered far more acceptable).
Been reading Jonathan Riley-Smith's
Crusades: A History. Fascinating stuff, just got through the chapter administration in the Crusader Levant, discussing how the Crusader states of the Levant tended to have a confessional legal structure where Muslims and Jews were tried under their own laws, and how they tended to simply reverse the already-established jizya to apply to Muslims and Jews rather than Jews and Christians. Highly recommended.
