In my book, more Jewish. But that's like asking if Ted Kennedy is more of an American than Margaret Thatcher. You may prefer Thatcher as a person, but when push comes to shove, Kennedy is an American and Thatcher isn't. If you think Jesus was God, you are not a Jew.
My mind boggles.
As a Christian, I'm amazed that, after predicting and awaiting a Deliverer, they miss the boat when He comes.
Worse: Anyone who professes a belief in the very Messiah they awaited actually makes them a non-Jew!
That said...good discussion, all. Some excellent points made, and a lot's being learned. At least we're not talking past each other.
Oh, and I would not say (even for a minute) that a Christian, or anyone, has the right to define one's Jewishness. That's for Jews to decide, as is only proper. (We Christians rightly get upset when Mormons, for example, try to make a claim of being Christian.)
Though I disagree with the conclusion of Judaism about the Messiah, I agree with virtually everything else that I do know about it, and were I not Christian (say, Jesus hadn't come), I'd convert to Judaism. Seriously. I think most Christians would, were that the case.
Peace.