Please correct me if I am wrong on any of the biblical facts in this article (I have never read the bible so I don't no that much about Christian beliefs).
In the answers above many miracles were cited as evidences against Jesus as a wizard. I think they could all be done with some sleight of hand.
- Feeding of five thousand
In the Deathly Hallows Ron complains about their food to Hermione in a quote, I can't remember it exactly but she says food cannot be created from nothing but you can make more if you have some, e.g turning 1 fish and some bread into more fish and bread is allowed.
- Raising from the dead
There are sleep potions that would mimic death, take one of these on the cross so you appear dead then when buried dissaparate out of thee cave to be "reborn".
- Raising others from the dead
In those days you were dead if you had no pulse or breath. If the person's heart was in spasm or the patient had another hard to detect injuries, a spell could heal them. It would be hard but possible. Alternatively, could he have the resurrection stone?
- Passing on powers
Not sure what powers he gave but could he have cast the spell from behind the scenes? Or given them an invisibility cloak?
- Virgin Birth
Mary was lying. Children out of wedlock was very bad. She would be trying to cover it up so if she was a wizard she could lie and hope people would believe her. The punishment would be death anyway so she had nothing to lose.
Pretty sure this is done in the books, summoning water was definitely possible at any rate.