Maybe he existed… but only as a common human and all the supernatural things were added later

Lets consider that jesus did exist and did someone have a cure for leprosy. Why didn’t he give that cure to everyone??? We still have leprosy today, kinda proves he didnt have the cure. But again lets say he did and he only gave it to a couple people, not a very godly thing to do, to withhold that cure from the entirety of humanity.