My life's two passions have been mathematics and being Jewish. I viewed life as one big equation and was always looking for its solution! So how does Jewish boy + a traditional Jewish education + mathematics PhD = believer in Jesus?
My paternal relatives, the Rogoffs, came from Russia and Poland. My name, Ziggy, is short for Zigmund, in memory of my maternal great-grandfather who died in the Holocaust with most of his family. His daughter, my bubbe, survived and arrived in England from Slovakia in 1939 and settled as a domestic servant for what she supposed was a Christian family. (In my bubbe's mind, if you were not Jewish, you were Christian.) But when the family insisted that she cook bacon, Bubbe refused, explaining that as a Jew she was forbidden. They threatened her with deportation, and she ran away that very night.
This experience confirmed my bubbe's views of Christianity. In her thinking, the Nazis responsible for the Holocaust were Christians. Now her Christian" employers wanted to deport her!
Stories of these cruel injustices filtered down to the next generation and the next. My younger brother Richard and I were brought up thinking that Christians were responsible for the Holocaust. We grew up in London in a traditional Jewish home with our parents, Alan and Hilda. I experienced the rigors of traditional Judaism from an early age. My family kept kosher, and I went to Hebrew classes three times weekly. My bar mitzvah, held at the Wailing Wall in Jerusalem, was a landmark moment in my life and summed up who I was: quintessentially Jewish.
I went to university and studied mathematics, followed by an applied mathematics doctorate. Being Jewish and a mathematician were intrinsic to who I was. While at university, I joined the Jewish Society; I was proud to be Jewish.
However, by this time, I would have called myself an atheist. Even if there was a God, I reasoned, I did not know him and had no way of knowing him. I still went to synagogue for the High Holy Days, but I was gradually becoming less and less kosher. Being Jewish was so much a part of me that I couldn't let go of my traditions, but I was troubled that there didn't seem to be answers for me in my religion. I thought God was just unknowable. And with so many world religions saying different things, the idea that one religion was right and all the others were wrong just didn't seem logical.
When I was studying for my PhD, a good friend (who wasn't Jewish) and I used to talk about God. One day, my friend told me he had become a Christian. I thought that was a rash decision. He invited many of his friends to church, but I was the only one who came. I don't even know why I went; perhaps it was because he was one of my closest friends and I wanted to honor that friendship. Perhaps I just wanted to understand why he had made such a choice.
Then my teachers gave me a book, Betrayed, that was to be instrumental in my understanding that you can be Jewish and believe in Jesus. The book tells the story of Stan Telchin, a Jewish man who decides to prove his daughter wrong when she comes to faith in Jesus. However, when he reads the Tenach and realizes that Jesus fulfilled the Messianic prophecies, he and the rest of the family also come to believe in Jesus. That was when I first understood that it was possible to be Jewish and believe in Jesus!
At that point I really wanted to know if Jesus was the Messiah, and I knew the only place to go was the Hebrew Scriptures. Jesus would have to be in there if he was the Messiah! Stan's book showed me that the Scriptures held many prophecies that pointed to attributes and characteristics of the one to come. I pored over those prophecies about the Messiah. I knew that the probability of the Messianic prophecies being fulfilled in one person was virtually zero. So when I realized that Jesus did fulfill these prophecies, it felt like comparing a fingerprint with a finger and getting an exact match.
My family had no idea that I was investigating the claims of Jesus. I didn't know any other Jews who believed in Jesus either. I even attended a men's group in a synagogue for a time to see what they thought of verses in the Tenach about the Messiah—but I never mentioned the Messiah or Jesus to them. Their answers did not satisfy me.
However, when I realized that the portrait of Jesus in the New Testament matched what the Hebrew Scriptures said about the Messiah, I was overcome with both joy and fear—joy because I had found a great treasure, and fear because I stood guilty before a holy God. And then I was overwhelmed as I understood what Jesus had done for me. He had taken the punishment for all my wrong actions and attitudes, what the Bible calls sin. I was forgiven—not because of anything I had done, but because of what Jesus had done! He was the perfect sacrifice, and from that day on I knew there was a God, and I wanted to live for him and with him at the center of my life.
Not surprisingly, my family was very unhappy at my decision to follow Jesus. Indeed my mum was angry and wouldn't discuss my newfound faith at all. She wanted me to see a rabbi, but she never followed through. My beliefs impacted my life and I began telling my work colleagues about Jesus. I was working as a risk analyst for Deutsche Bank, and I frequently invited my colleagues to Christian talks. There was no conflict for me when it came to believing in Jesus and being Jewish.
I used to think God was unknowable, but now I know him. As it says in the New Testament, "No one has ever seen God, but God the One and Only, who is at the Father's side, has made him known" (John 1:18).
I have always been able to see life as a series of equations. Mathematics has always made sense to me; being Jewish has always been the most important thing to me. Now I can see that being Jewish plus believing in Messiah does equal faith in Jesus. And I want the rest of my Jewish people to know that it can be true for them, too.