When the dead sea scrolls were discovered, it showed that there was very little difference between what we have know and what was written then.
Its easy to say that we THINK that it makes SENSE that the bible is not the same as it was in regards to the original docuements that came to be "the bible" and we are probably right, but we don't know that for sure.
Nevertheless, we MUSt take what is written in the bible as a WHOLE and not as isolated parts to justify our own doctrine ( organizational doctrines).
You mentioned the cruzades, they had ZERO to do with God an Jesus and IF people had access to the bibel as they do know, one HOPEs that far less woudl have been brainwashed into that crap.
As for the blood issue, that is selective interpretation of something that is NOT EVEN stated in the bible.
The bible may be used as an excuse for many things, not much of a gray area there, but lets put the blame where is needs to be, the PEOPLE not some book.