That is an excellent question. Assuming just for the sake of argument that he existed and that the ideas attributed to him are somewhat accurate, it seems like he mostly liked to walk. There is that one story about him riding a donkey into Jerusalem. I am no bible expert, but isn't that the only story involving transportation where he isn't walking or riding in a boat?
So, the donkey was a pretty humble critter upon which to ride into town. Therefore, I suggest that if Jesus has only Harleys to choose from, he would choose a small displacement Sportster.
James BlackHeron said:
If you like (older) celebrities on bikes, check out this site every couple of weeks.
Judging by the condition of the pavement I am assuming this staged photo op took place in Chicago.
From Bike Snob NYC