I'm afraid you've been led astray by OCR. The original quote is:

"A picture in tapestry was hung up, of a number of Jews stabbing the wafer, the bon Dieu, and blood gushing in streams from the bread."

"Bon Dieu" is French for good God--it was (is?) a common name for Jesus in French, and Adams is in Brussels here. He's most likely reminding himself/any readers that to the people adoring the tapestry, the Eucharist is the body of Christ (he definitely doesn't think so), and conveying a bit of local flavor. There are a few other random French titles scattered around this part of the diary.

Concerning the survival of the tapestry: eighteenth-century art isn't really my thing, sorry.