origin of B-Jesus as in "I'll knock the B-Jesus out of you!"

Cecil’s article on the origin of “Jesus H. Christ” made me wonder about “B-Jesus” or “BuhJesus”…???

It’s bejesus.

According to dictionary.com, which every good Doper should bookmark:

It’s generally spelled “bejesus” or “bejeezus.” American Heritage and Merriam-Webster say that it’s derived from the interjection, “By Jesus!”