A reader asks

I recall recently reading one of your articles on either Inside or Exchange, and seeing something along the lines that within the first 500 years of the Christian era, 5/6 of Israel embraced the faith. Could you point me to somewhere where I could read more detail about this?

Your wish is my command!
Here’s the salient point from Neuhaus’ review of David Klinghoffer’s Why the Jews Rejected Jesus:

Scholars generally agree that in the first century there were approximately six million Jews in the Roman Empire (for some reason, Klinghoffer says five million). That was about one tenth of the entire population. About one million were in Palestine, including today’s State of Israel, while those in the diaspora were very much part of the establishment in cities such as Alexandria and Constantinople. At one point Klinghoffer acknowledges that, during the life of Jesus, only a minuscule minority of Jews either accepted or rejected Jesus, for the simple reason that most Jews had not heard of him. Some scholars have noted that, by the fourth or fifth century, there were only a few hundred thousand, at most a million, people who identified themselves as Jews. What happened to the millions of others? The most likely answer, it is suggested, is that they became Christians. What if the great majority of Jews did not reject Jesus? That throws into question both the title of the book and Klinghoffer’s central thesis. The question can be avoided only by the definitional legerdemain of counting as Jews only those who rejected Jesus and continued to ally themselves with rabbinical Judaism’s account of the history of Israel.