Though used commonly like "scared the bejeezus out of me", Bejeezus is commonly associated with Billie Joe Armstrong, the lead singer of the band Green Day. It works in tandom with his signature performance pose of standing straight up with arms straight out, appearing similar to a crucifix.
It is also Billie Joe's "description" for his Instagram. It is commonly used within the fans, (American)Idiots, as self titled as a sort up rallying together term, mostly used as a hashtag.
This word is in no way related to Jesus or Christianity in any way apart from the similarity in its sound.
The Holy Bejeebus is a figure much heralded in a small corner of Nottingham. He is somewhat of a cult figure in Dunkirk, near Nottingham University Campus. The Holy Bejeebus is a religious figure with supreme power, which is undisclosed to the world. His coming forth into the limelight wont be for a few decades. His symbol is the 'W' which represents the three holies: Holy, Be, and Jeebus - from where the name originates: Holy Bejeebus. His followers are reffered to as Jeebites - currently there are only two: Jackie the Unclean and Pants the Pure.