How many people of non-christian faiths believe in a historical Jesus?

[J. J.]

referring to "faiths" as discrete entities of equal significance that can be measured by "percentage" is absurd

I worded it wrong. I ment people of non-christian faiths.

I think most would acknowledge that there was a person named Jesus, though many might regard him as a philosopher.  I think the number that acknowledge that Jesus existed at one point, at least would be in the billions.