You made up your story.
You imagine that your HJ was a Jewish teacher who was killed by the Romans.
You must have a vivid imagination because you have no evidence of such a story.
Please, if you don't mind, when did your imagined story happen?
What sources are you using?
The Bible?
Just because Galatians 1.19 is in the Bible does not mean it is true.
Do you have a more plausible explanation for the origins of Christianity?
If so, you can publish it and make a million bucks.
What are you waiting for?
You better hurry, Richard Carrier's book will be released any day now, you don't want him to beat you to the punch, do you?