Religious Jesus really is a construct inside the head of the believer. A deity that you view as a moral authority is an abstraction that personifies whatever you think is moral. If you're a pro-LGBT equality Christian you imagine a rainbow flag Jesus, while if you're anti-LGBT equality you imagine a no-cake-for-gay-weddings Jesus. The notions that your Jesus reflects some hypothetical Jesus encoded in the holy book which further connects to an actual Jesus -- divine or not -- are religious notions that don't end up squaring with how religion works. And there's nothing Jesus specific here, it would work this way if your deity was a magical flying otter. Really it's more of a narrative role, like "the good guy", and that's as subjective as whatever you consider "good".

In that context, the existence of Jesus is about validating whatever you project onto him, which is about validating yourself, since the abstraction is a projection of the believer. So a hypothetical historical Jesus has nothing to do with the religious phenomenon, the same as a historical St. Nicholas -- who might have existed as a guy who punched another guy at the council of Nicea -- has nothing to do with the Santa Claus inside a child's head. The child's Santa Claus is an abstraction of getting Christmas presents, and perhaps a personification of reward and punishment if the child believes their presents reflect their behavior, and that will be driven by the child's feelings about themselves as a "good" or a "bad" little girl. Again that's about a narrative and Santa Claus is a narrative role. Any historical St. Nick is irrelevant.

Anyway, was there a historical Jesus? Doesn't matter. The folks looking for one aren't really looking for history, they're looking to validate their religion. If there was a historical Jesus the details are lost to history. But in a realistic hypothetical, he'd most likely be the same type of guy as other cult founders -- Joseph Smith, L Ron Hubbard, etc., -- a grifter out to fuck bitches, get money. Which should be the baseline for any conjecture about a historical Jesus, but isn't. Because historical Jesus isn't about history, it's about religious apologetics.