The main problem with Leo is that he is a Modernist. Jew or not, he is no good.
That being said, St. Peter was surely not made of the same stuff as the тαℓмυdic Jews of our time. He was an Israelite. They have become extinct.
I find is very suspicious when people treat the Jєωιѕн question as a joke, like some of the comments we have here. There seems to be some evidence suggesting that all Modernist Popes have some Jєωιѕн blood. It does matter, even if it is not the most important aspect.