There is no way of knowing how many of them actually trusted in Christ, but the actions of many of the crusaders clearly reflected that they did not believe in Christ. Another thing to remember is that the Roman Catholic Church is the religious group that primarily ordered the Crusades to be carried out. There are many issues with the Catholic Church itself that teach a confusing message and false interpretation of multiple biblical texts, and as such, this easily opened up opportunities for false beliefs and blasphemy that lead to a flawed understanding of the Bible.
Then what you are saying is that you don't know and all this is based off an assumption. The people in the Crusades most likely believed in the God of the Roman Catholic Church and were true Christians to the Roman Catholic Church, therefore "true" Christians is a relative term and the definition of it is defined by the sect of Christianity.
